Malicious PDF — malware analysis report

Static analysis result for SHA-256 0113f540ca98660f…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 19:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9431d1919d2a1231c98da256b1f275d7 SHA-1: 068425a944c42c9a97cda5f0111e8df7a0fdce36 SHA-256: 0113f540ca98660f42494e73179f75450584f5488b29a883fd5fa20f3c296859
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains numerous links to compromised WordPress upload directories, indicating it is part of a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classifier flagging strongly suggests malicious intent. While no scripts were explicitly extracted, the heuristic 'SE_CALLBACK_LURE' suggests a potential phishing or tech-support scam pretext, further supported by the nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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) or Microsoft license-boilerplate 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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8181a238---37097137130.pdf In PDF document text
    • http://smclassof57.org/clients/34860/File/lurajeb.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9pu54beeumgkkp05155789329h/77626050431.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074a76dd7fea---29715844782.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/mobezagelipatugamizop.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/93193418528.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/gojuwagapinarakirudejazu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b3aab89125efdf46cf7fbc7517500d0c/36397166150.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/vufipovovegerasigibugizub.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa1044e21---zujiwonasafukepa.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210626135908.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/dufedodukoxo.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/93246570148.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/71543666590.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4cdf8ca7b---jasawaselod.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210618215937.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/12261516637.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/24899638797.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1e6872db9320616969c1413642bc33c4/powonopulezawat.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f90cd83253a7d7ed4cf9eb5c714bcfde/71724190185.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79aa1e649---91202382227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=population+per+countryPDF 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_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 17848 bytes
SHA-256: 897cc836b63b8c7d0bfe795d2ac37d8116abf8de89231879a8ae2929cafca2fd
font_02_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 10412 bytes
SHA-256: 7e816b668903341db7194295681daad5d165bdc2400aaf7a31b34a8f1ed4b07f

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