Malicious PDF — malware analysis report

Static analysis result for SHA-256 175ddcf5b78d0158…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 05:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ce72b544a10811a5b0d3f6d1d4ef7d9 SHA-1: a26a5d50929c805badc466ebf9d183d81eaec617 SHA-256: 175ddcf5b78d0158087a256bb0ca48a68c3affe351a027e72c223c536f358444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly indicate the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://britishcytology.org.uk/ckfinder/userfiles/files/48898923156.pdf In PDF document text
    • https://dichvuketoansg.com/luutru/files/regifarijetonubamodamibad.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/94788475871.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d3ed37b6a7d66c1de6021f90d08f1bc3/sibefepulafube.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210621131758193.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/82657909518.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64cf7eec80---jumugidovepix.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gbr4q4qcmkin8oostta51hffm5/81537473090.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cdcaa2fcb566dbbe9dc433ee29a3ddd9/lufufajarotufe.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/23071815012.pdfIn PDF document text
    • http://poorclarescork.ie/images/90519965572.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094990dba22b---54283503946.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210625022153_2043709227.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/68663220739.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/1233137011.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b388142ce---furuvotebazivabigum.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/25392269455.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/xalora.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5811a6add11da608fba08effb6f3ef5a/17361914878.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/65028134201.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f4411a4df---42330398738.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/152b4c661abb0af7cffe17d5e96c1e2c/69789255549.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/aa1517d2b4917bfca63127886e036596/57531994589.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/vamixureromewepegali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=grammar+test+for+upper+intermediate+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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 10752 bytes
SHA-256: a710491b14817e53f8bcf78886ce61aa972299e95519260427a95dd277f2291f
font_02_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 17196 bytes
SHA-256: 04dca93a13513bd2280e6bf2a370cb53b28ad2e0af5a2868e1011fd25bf21912

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