Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fad4229f3b29d1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 13:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6613366cc43dbb02383ad34f36cddefe SHA-1: f717b780430b1e4da44f8603ac4d5515c479785a SHA-256: f6fad4229f3b29d1148502efddf86f138f3d842f8b9f3b8a54ca2b3a0946b22c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://serviceservice.eu/userfiles/file/jalobomizova.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c97cd5a9---mumulakerozekuj.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b9a0c587---raxumop.pdfIn PDF document text
    • http://budropol.de/Upload/file/gesurexezoxewonutid.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/lisexepikusaj.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210823143733_xus7yd.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/28c4c46b2ef9a58d5756935bbe846f4a/lemenosep.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/53562612021.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fdaf6ba5e47f01b1ac6fbbfa70d31da9/forolubabuk.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210825_C547C548D613BF32.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090c91961c54---97862998957.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/56123268267.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f16074823---wuwoda.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukt9j35too65lcfmiipm8ch8ta/20561279358.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/24646746196.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/71102405712.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vosodowikixivejonarixo.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/17772628805.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/03d6210c845e0e2f6be9b14099ea4449/88054839354.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f56f0ed606d91b7ea9de6b36da89af26/3714004916.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e074d38fa4b2ef5cba0a6cf98b255890/66210759113.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/i2ml8itgl26aij00tlbevne9p0/xonomexekit.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bujikoselefegumuxulo.pdfIn PDF document text
    • http://opsir.eu/files/file/wifariv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+connect+to+a+dead+soulPDF 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_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16420 bytes
SHA-256: 3c8c9a013df0cc0b50f8e9d0ca044e59579a151da0812fedb268f3e939628631
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 10348 bytes
SHA-256: f7b8ce18d2b78c858430fdccda88183d2ef1b23cbd529e4a9fec054d0abfa749

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