Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e6a1374d490f81…

MALICIOUS

PDF

88.7 KB Created: 2021-09-13 20:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29889c9b5907e25a7dc6715fc5d10f31 SHA-1: a30bb5b0751b51a1e05528d73ba50d84ee3aec68 SHA-256: 34e6a1374d490f815e7938804af5df60a86d339acfc8dcb4193086088923e171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites and potentially disposable hosting. The PDF contains numerous embedded URLs, many of which are hosted on what appear to be compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pixomot.ru/uplcv?utm_term=line+dancing+classes+for+seniors PDF link annotation
    • http://bluelakehomestay.com/uploads/image/files/ponepije.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/lebanakizitixit.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/zukozuke.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/40317563667.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/14660368909.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/sdhvivle21o0ip96e9oi1tq67s/jadasum.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/devizesunanerosenovomevem.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/fotosul.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/41600132452.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/palemamunidiwusesifamulem.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfa90dc5f---duvowip.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/sirumaxali.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/17628510982.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913072825609942.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d84358bd6---nadaj.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/luvomer.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750b0e7628---89736573839.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613651e15767e---44233753181.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/11681978598.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/lawaginadipereno.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/73745282695.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/97131991078.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/99438935124.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/vadizisiwiwe.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/26006225752.pdfIn PDF document text
    • 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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 18856 bytes
SHA-256: 1e5a56ea8c011e72748a9f2d0a9e649f999948bfb039261b2d2ce645f95fb752
font_01_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 10508 bytes
SHA-256: c0d72b07be0fa00f423da62b8d7f2779e2d3b59d2e3f89fcf3e1b936e51108eb
font_02_sfnt_off00013d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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