Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfebb3c8b032cc79…

MALICIOUS

PDF

71.1 KB Created: 2021-09-07 18:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa3a3c85bffec9d2b857f30aaef60c6f SHA-1: 34b97ba7f7f7033881a24f4af21be46115d8c43b SHA-256: bfebb3c8b032cc79c83212418f31a526d72263ca38aea3d9ae48c59418ef05ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites using the 'super-forms' plugin. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to obscure the true destination or spread malicious links. ClamAV detected this as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as highly malicious, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7c4b78cc5855afad37c46f99fdac4fa6/39767784039.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/31fbl064ptmqhe9n9uum6s2fj2/67925509127.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/noparu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7f670cb69ded859fb5450688c5b67bf0/gewusunisaverosamajad.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/06ba2fe7c5fcb436d96dba07bb22fa7d/raroxitofotekuvovafajew.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b9faba02---tuvisemug.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/47128758928.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/29959925879.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9a48684783859a232cc9251a9178d2ea/15900288239.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/bezolelo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad049dfa12---816180566.pdfIn PDF document text
    • http://parfumkin.ru/files/files/wawifuxasilap.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610bec43dab0f---kanojazifax.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/5827070577.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63f90513b---mefab.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/turipoxudipevifosonidoja.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/29527379606.pdfIn PDF document text
    • https://ikima.fr/uploads/file/70392210091.pdfIn PDF document text
    • http://benrassam.com/uploads/files/42556470732.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/20778540034.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b59b2e0d---zogawurugukiwugerudidaf.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/61677351724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=operating+system+programming+tutorial+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_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 15316 bytes
SHA-256: 83a13e2b6040e49c1f5495e1141b2b5a7661db461a2ea84cdaaca8b199969d14
font_01_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 11080 bytes
SHA-256: 756b8d0082424f23099a656caeba11e0208114a3ace0758be400ecdef8d57b15
font_02_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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