Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84d889fbb732602…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 15:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d415706d3e10516b065c4a67b308c59b SHA-1: 4652f0ef8c89183f39bb39c5a143773fd747b78a SHA-256: a84d889fbb732602d411f43b5d45b9e28e554031549f7a32b950fdb019d14180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating it's likely a phishing or malware delivery attempt. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior, and the ML_NYX_PDF_MALICIOUS score of 0.995419 strongly supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/hrlaot5ad6u43uq7c82hf4i7sb/61781368189.pdf In PDF document text
    • http://malbreil.com/userfiles/file/zumikemejulik.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/gixafigilumokarim.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/zoxakenoluvovunomukup.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/zagixumuvuxojelota.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af938e43a1---33870580191.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/36373891286.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/80427916062.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/40934133852.pdfIn PDF document text
    • https://5udua.com/contents/files/wimepinon.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910030602.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c42562e488---zewubipep.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/68592320657.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/17262338314.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20210924133505.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/14554138993.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/bigodavo.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/98030596476.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b6f18299---99886456078.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/78540742360.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xuxinexirexok.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614443ea06685---42750586694.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/poxewunilufamifofej.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-25/20210925021504539641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gol+gappe+full+movie+watch+online+freePDF 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_off0000aff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 14748 bytes
SHA-256: e0b17cbaf1078f8d8f88f32bac0d0081457226fae06ab2c3adbbda458419b4ab
font_02_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 11052 bytes
SHA-256: e224e4500cf9bb9d60c90a67e527ec126116a28a2c1fa7170b5fb49c985eb614

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