Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db6f44a504f8d6c…

MALICIOUS

PDF

91.6 KB Created: 2021-09-06 18:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6035cd7dd28b4009a75e24b27b22198f SHA-1: 91a05b608eb1a1276c7f3f264ce53a99b32f837f SHA-256: 6db6f44a504f8d6c1982c90eaf6143bd3c61b2e0bd0d21abce3258798e6e2d64
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://celcg.pl/uploaded/file/7850944840.pdf In PDF document text
    • http://fundacionecla.org/resources/original/file/zebosobozojuvilazod.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8922a4c255a868ace70331d7403d3e94/bubabek.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/28384650346.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/medosofuxanukibafuwum.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/5236b98c392d46c05b1f662d03cfd44e/16456773278.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/48489783705.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d528510c697bf1e0d47bf10a396841a2/71652106116.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/85287534266.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b801c950029---fikaposisipizosum.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/73194905481.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/vovoni.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5a727635---varezini.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/lavaketapimuja.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/n3qi4bgtj3ingq40chd6k3h78b/23771487659.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/7287139741.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/74583592014.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/97962659787.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/nitagekexejevapeli.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/53600641737.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c122bc0f781---razununafivagijorok.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e36e02353---90938344563.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/losobobitan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=occult+anatomy+and+the+bible+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_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 18468 bytes
SHA-256: 4b97c8437a4765039f3aa0742c15fc725cfbada849b7a20f13f4330978a1b78c
font_01_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 10996 bytes
SHA-256: 82f498c9493a39b7fb274d3e0dd020c42a7f3d985a3399971a2d9af8da77d580

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