Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ef554f0a882b35…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 23:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd1a52578e9381abcbb4f510a2d12507 SHA-1: bcbac0b5f6267cdee850bd272a8f2d9c75d54e56 SHA-256: e6ef554f0a882b354b36e65f5d8424b0dbbb10e3cedce5ee3c26112f0e84d1b4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing attempt. The presence of 'invoice' and 'payment' lures, combined with the ML classifier and ClamAV detection, strongly indicates malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that may leverage embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/533f730d0b1a46ba1f3b066f4f65c03d/lenokanazojiwekakutogiril.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/671d8a98fe5446abd6a2bb32a3be7826/86789610358.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ac8bb2434a7aac4e35ba3e3e1f82046b/82767640223.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/67391290421.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b65ae631c---tuxuxefizozumet.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/41953691960.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/felixitimeronanunizelabiw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a4d9a2fc---xexoborako.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/galovisivumim.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611efc3908f9f---29012357922.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/16374553311.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c66d6924b---62104817361.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2c6799c7501bbc2154e34083f0b80fbe/dagum.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/22156769385.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/88684837509.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/56538404030.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894acd31b82---85395104051.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/80842591a12c921ab0805ef78d538ade/finizit.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gt5nnfvl970hug59lgs2vg62a4/koxipodebuwi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e466373ced---74109593624.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ac592e5064d9d8fb5330f90ac4c00d70/gusojalela.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/jizida.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ve0tnlapd4tm7jl1hd109uqhni/10662390595.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/sibufuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ingenico+ict220+manual+batchPDF 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_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 17848 bytes
SHA-256: aa623be1b521fcfc15dcabb42de71df988724ca085b55c6da63142b39febab73
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 10844 bytes
SHA-256: 7cd38ed8af18d07b93c9ed78b746660cb5bbf72a27c1c61db66fda3e2f059734

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