Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0f98a3eb68929e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-30 02:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c0c13b0fe291e46f0fa22eca876396c SHA-1: 8275dc41c6c72c79cd6bef31980b13794f292015 SHA-256: ae0f98a3eb68929e105e34e996859dffe0b63ee4dad089bdd8e6029284b8bb36
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection, indicating malicious intent. The presence of a 'MFA / one-time-code harvesting lure' heuristic strongly suggests a phishing attack aimed at stealing credentials or session tokens. The document also contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable, likely serving as part of a link farm or redirect chain to deliver the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacd5315c4---15180870279.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5240108d79ad834d99d944786b5a6f13/zimevidamufozofitu.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/rotebezamibobapofiv.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0d26b90b372ef9394e4f3cbde805a7d7/49293828815.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/rujufu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2be18877---rowipegafuzibezo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c75219378f0---49476831185.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03e34edba---8073965613.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/zokusojiguxef.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/savuditoxali.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090189e1bbf6---tejewidi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892adaeaee6---30107737067.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c4782c962c157efa949464993ab0dfe1/jurixopalo.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/54703ed4e0abd9c854d6755786f4c8a0/62512072579.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160857b8bebce0---12977857137.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa29c06a4ed---fefiribobe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pokavoxode.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/146bevgsq02uo19gs65its64tu/sabuvimawibafuxof.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/sadilidud.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fe3eb728---fasumukikuwuxasiza.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6811cea61a---rumabarajavapovi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f4e27224---11597194337.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bhk7cjbg04jc27je9pi8k23fqb/gerinar.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/37566555482.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/31096066037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+reset+fc+code+on+adt+safewatch+pro+3000PDF 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_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 10952 bytes
SHA-256: 99a4127471770f722db091f1fc923b68e4e872da62bb1ac37d3b1b3ec71df98f
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 17476 bytes
SHA-256: 4c06d5ab19ddcb373e3100ee1df61aecd9919324d566ad0298693e6ce33d1ef1
font_02_sfnt_off00013a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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