Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5956938e140e59…

MALICIOUS

PDF

97.8 KB Created: 2021-07-25 12:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edd64dd22b0012c2fca7044dee40b428 SHA-1: efa1de79fa933f83f58e5528c55c15ef29a7f364 SHA-256: 7b5956938e140e5925e4a75d1d44fe341df8c4549e4eddfee4ba4e6fdd2f8a8e
356 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores T1110 Brute Force T1078.004 Cloud Accounts

This PDF document is classified as malicious and exhibits characteristics of a phishing lure. It contains multiple links to external sites, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The heuristics indicate lures for password archives, MFA harvesting, and recovery secret requests, strongly pointing towards credential theft. While no scripts were extracted, the overall pattern suggests the document is designed to trick users into revealing sensitive information or approving fraudulent transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 11

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/093560f0b13e3e796929a860c485d148/11272947818.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093a60f6f8b3---beliriva.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zirobikonobinulozafeziser.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/90930749154.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/94325277cd7942258a58e79f8957b15c/desolepodiwufubimur.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/jotegok.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/l6tbhpjv0ea2t2sjh8nb71jsfp/74516282941.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097858b9590d---17351426281.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdebd337166---1887210762.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4f6ced92f421b1a27f4528045fcc857b/6901490007.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/19736256207.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fa794fdff2d3c56f8484e10b841e48eb/14066746235.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/72935245814.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kl9drlaa8u2q5srdn2sa2dht0g/40456291937.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/32852406da2485bf65ab10856139327a/kasawedadirele.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3c16cfc1ee7eb8b5b816135639c0972/17172620368.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/xesulawiwawujuwibega.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/71824878157.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/mefidukunepen.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/36296754707.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/53360247064.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/vozagiwapatekuvunazovefi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/39736217593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+iphone+6s+without+restrictions+passcodePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 17104 bytes
SHA-256: f72e8e7c8e630b603cb1d714717e87298ab44e225ed53e271101f48f6ed8e2c5
font_02_sfnt_off00015eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAB 10912 bytes
SHA-256: 20202853a58ea849313b1cc4515414d48523964cefe0ba6e1ebba7aa1f661f61

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