Malicious PDF — malware analysis report

Static analysis result for SHA-256 70af6afaa6f3523c…

MALICIOUS

PDF

97.8 KB Created: 2021-08-07 16:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: db84731f17d83726f8abcc7e5ab97b42 SHA-1: 3ec541596ba00bfe497b40cec950a9b88ef43a32 SHA-256: 70af6afaa6f3523c72d9abaac7c34d2c1d828a02d4113db834915e2d2b8076e5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/17vc3vbm533joenb8jg4bb93p1/50979363148.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8253c0fc0ea89059d1484f559a0fee1/98968127627.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/56552948217.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h50e5paa2gsman86nurcs7c7nr/99840654790.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b919bbeb428---53447373265.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/b0md070n0phb2eavrah6vnj65k/43849814392.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8d57a2a7e5148e680f60ac49e23d5069/mopagovuwiloseripomibev.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f5d3b0719cde17304f88018104f82d12/42945758646.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/71057732080.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/5202602458.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/votoga.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/77145019774.pdfIn PDF document text
    • https://jagominum.com/contents//files/fiwilevaf.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8cccae82---59039932447.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/68762185744.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/43915585850.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/54972969446.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607510603d633---50345077130.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gadalekotifoz.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3174adb7f44f203a5fc30444f734e294/duduwisibavidaki.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/22565392606.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/pekefoxizisaliwatadifuxam.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092afe2b2dfd---99629777237.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607251482d7c6---83944015953.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5ea35b25---4580221069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ahsoka+tano+in+star+wars+moviesPDF 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_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 10552 bytes
SHA-256: 4e5d04f9bddc25a8e254146ea3a7ccea98c89820363a4177628db90fd73d9cc7
font_01_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 17296 bytes
SHA-256: 9a7fc915edd409f895d5d9d9c99ef193b78f15a45af317f08b97a27f76160bec
font_02_sfnt_off0001620a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1620A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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