Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1578577a06d0964…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 12:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2be3bfce2013eeaa1c03fdedf47fce26 SHA-1: aca5166c53cea5394d72b92d75fcc8d1e76f4b9f SHA-256: f1578577a06d096465dc12b092e569515b1964bf02d7a0bddba13e5d43e27303
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristic firings confirm the presence of external links and compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://arerp.kr/data/file///17575058182.pdf In PDF document text
    • http://asiadomainstore.com/userfiles/file/jasazawigexobutivozopiko.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qplsmfveb74kbhlfi3q4555rf7/83019833496.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/15515739904.pdfIn PDF document text
    • http://alptw.com/images/files/wizixuwakopinalas.pdfIn PDF document text
    • http://laduses.nl/image/file/kuzepuvidu.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/gukone.pdfIn PDF document text
    • https://plasy.com/uploads/file/78630722576.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/lutowopitozi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e66280f6---jonekuv.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dad4238b2ed2c396af8ce29815700a33/60286607699.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a29052c75fb---venavodawarup.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16106fb57cfc70---vujimubegotus.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/84036391817.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608896d624e67---67347250066.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lovizija.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/08206900b98fc90b333fff054b2ae691/56407692622.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df7217315fd---sefonuwabaxaxatobiluduj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/70ecbfp4uf837sk1ctr22phd9j/77660359282.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e56ccf7f5---masejuxidetulivegane.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ae1ccba552022673e5b8dc710457036a/mumoximiwodijabepod.pdfIn PDF document text
    • http://zerosquareonline.com/file/muxetuwobowumuzifive.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc71ef367e---watototaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gender+race+and+class+in+media+5th+edition+chapter+summariesPDF 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_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 18076 bytes
SHA-256: 4ae6ab8166668242f396a02c9834680d77ce1245c2a6d7408e178b493a5a649c
font_01_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 11052 bytes
SHA-256: a8e0a84c54f7bb02c2e35c88aa54888e92c0313efb2078be78dc378b9c825447
font_02_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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