Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1865ee99aa15ea…

MALICIOUS

PDF

100.4 KB Created: 2021-08-01 06:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce17c0f52cc7c55faa8547eed2b774c8 SHA-1: 16e0b11f6ccfab350f08545fe8e319369e36379a SHA-256: 7b1865ee99aa15ea443cecf03c409ba30aa236d90d0d3f443f68faaeb4cd924a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters further supports the link farm and SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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://zegabilisim.com/calisma2/files/uploads/majarubodagesoravebed.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/a2b57983f6ed7022db0dced021e61d48/5993167289.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/67583438273.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/95fc1bc0066294e73b350bd5f12388db/jibevagazoxe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a16a0269f024f05e49ef3e06619e325c/93639965092.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828224c3d4---78959020746.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/firudigujofu.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/devijakolusenukevu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/pozukaxeguxukuxedafone.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/11341833573.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a49b6cb4c9f8f55c1e62e29c34e7f2fe/nemaginupidoza.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/59201950851.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210610181059.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2113bc5bcd1b1e90e5d430f90fc633b2/4749288951.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809f449d0fa---14428263172.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/45a6b6472ab25fc0303e6e02c9202d01/78077482636.pdfIn PDF document text
    • https://flyags.com/editorResources/file///witozudasipepef.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/77r7ed7pu128m0k0oj8vrmmrcn/luvoxo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kjr5hsru33u3nbth7m9d8uujof/pitududapevirabu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3e9e2048f---49892841326.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/fisotuwixumiji.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/87101874640.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gnedmnvcgn55k267e6on4fr8cu/sofadiba.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/10a6513683d2425edbb7dac3dc7d3883/84307390188.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2c8cd36f8---zakuzuvuwixivakadatinojuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+treat+my+foot+after+wart+removalPDF 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_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 10500 bytes
SHA-256: 62e55083c6449113a60a253ec97b882d1aaff4892e0101a30217893378ab9dcb
font_01_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 17200 bytes
SHA-256: 0356b34f5dcd1e66b8290b644210add752e0e45b2dfa1965953832f813878dd0
font_02_sfnt_off00016b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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