Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f66e23d781cc54…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 04:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2bb0a6c7fc2a67cbb24ac4e6c83ca82 SHA-1: 202f493a2ce9d5aba26317ea7fc799b37ddb06de SHA-256: a3f66e23d781cc5498c0ecd1ce6c22ff18a0647b76c0421e0a4489457e39ba03
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to distribute further malicious content or host phishing pages. The document body is heavily obfuscated and unreadable, but the presence of PDF link farm heuristics and a callback lure strongly indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://stcc-sa.com/motakamel/Ups/files/58435159756.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af9dbaaae73---donajujajorul.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbfe8c3df7---13433465873.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/deda57f9435072360d15c7f50cfe1f3d/81313082897.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/94573250611.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8bdad9c454970fb209e3be3155d889a3/27846994175.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/76555975352.pdfIn PDF document text
    • https://maviet.vn/upload/files/kinivujetojosajubefinetas.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160755d614a557---torux.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/niroditu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a120503ba61c81de3724c3e131ddeb/wilerolilifedirukoz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabc3993ea---xesosodowitowobugokowefat.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/0a301fc0640776a102ad329335130679/sobuxike.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/91888855522.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2887c0ad3d---jowimedawunabelibasaja.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/besudofu.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/xumeturelapivuwa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f602966975a20942ab26e28abeaf96ab/zufotimaneve.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/puwosiladonilugove.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/12790112493.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/260541170.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9de387b82---sinamadozojeremufabit.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9c75efdb2---zorekivibidekutir.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/piligi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c47bb4mtscght116ufdif58cem/68281416843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mathematics+of+personal+finance+pdfPDF 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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 10880 bytes
SHA-256: 2bb93b4c46e2984e64a670e4de91506b4736fc027f08b57507e36796e2867edd
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 17964 bytes
SHA-256: b17cca3cc0af5b327b6db401ef19de6814ff6925b4317c0fa09531cd9a936568

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