Malicious PDF — malware analysis report

Static analysis result for SHA-256 c665ad4b864a0199…

MALICIOUS

PDF

92.2 KB Created: 2021-07-29 10:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2071993e0e82cff60a0df2dbb9c989a9 SHA-1: 9a1aeed923bf3a123cd01c4904e96cc586855986 SHA-256: c665ad4b864a0199831d9b09daaa33c0acfc86ea7e3978c59ac707563aa4982c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/562d384635f6abae343e11dbfbc746c6/makufoxolexetirisisusazel.pdf In PDF document text
    • https://boyanbolyarski.com/userfiles/file/33953393592.pdfIn PDF document text
    • https://ewt.cz/res/file/50673110816.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/wugimuxigogaginibir.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bfe40abe---vorazovarapikil.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/tevewebudobav.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wovuj.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797d3c783fb---dafodum.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6a9b4889---dawuzujitibewerilofurizu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/u75akfgakh69rqp02t83ou8177/nizalebu.pdfIn PDF document text
    • http://teakdeck.pl/files/file/46563674880.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a35137f1---forijisunixefofomidib.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/winagisulibod.pdfIn PDF document text
    • http://wawa757.com/uploads/files/rokojak.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/mavunuba.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/52278184246.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/87828784935.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/mafiboluxof.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/20448218773.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1c0687681a1aa598099c84c49d3b2540/5490362000.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e1c149b89b8797e96faae1e5702e2c0f/45749680902.pdfIn PDF document text
    • https://ckmandarin.com/uploads/38169389612.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210621005044466891c94e3d.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=challenge+grouped+animals+khan+academy+answersPDF 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_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 11284 bytes
SHA-256: bac6b4a64f00b42e6d6f81976a85b67a5617df47a7eb96501a04831b3a65fc27
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 17940 bytes
SHA-256: 83b02718978cb1755d047a6c7d6399d3e4b34442a8bb169bc212b5514435f952

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