Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf8f785397e744a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 00:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2886d36243c41973f1771844d2e38b1f SHA-1: cf358eb023bc86241acfd355b54dd39210887efb SHA-256: 2bf8f785397e744afbf6f1db7ee7d8276f3ec226533f90c522eb38c6f6f20532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains a link farm pointing to various domains, including compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://gfb.it/upload/fck/file/25593942577.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/449621f17fa1921a53bd851f84ed926c/50003587136.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607303dfedf90---bexamuwasamezan.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/12574077750.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/27603998186.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kugajoriju.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xalamaditisapaxaketofi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8f8a9eb9d92812d226ff9a20da3c7601/nurixufomomir.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3757d13dc8---sobidesijejup.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/44175136822.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5111aae72c42d5c2ce7ef2134de9b09/42331290568.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/gumato.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/94115573839.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/95443047370.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/74913641400.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tubaz.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/gowerisexawekusopite.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1ggr9untu1miquefp6elfe204n/kedutumuruja.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/jamalizuva.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16073336d7c456---85842474711.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/29353056875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=2010+honda+civic+factory+service+manualPDF 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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 11220 bytes
SHA-256: b0797e02cd71978babc770ba5764ff6574e5a9a1cef8e8c73bbcba9cd022450d
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16316 bytes
SHA-256: b4a5887e0357a99bfe3ed3e9d152f14d8a4c450987f603fe2f3d13eae222ace9
font_02_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1