Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c8f0fdbb80f7ac…

MALICIOUS

PDF

64.3 KB Created: 2021-05-24 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32adffc9dc8492c083bac3932838c580 SHA-1: d676bb6d6ff08b6d30f1dc816daa0afe0c90b0cd SHA-256: 39c8f0fdbb80f7ac4a3d28061bb87be3d77e02c8e337e4d2d3b544bcf1c7ab44
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded links point towards a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

Heuristics 5

  • 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
  • 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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d70b818d6---pusixevuwuxuvebojedejonur.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a810b6825e1---zedukudilovesulunusujiti.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49cf904ceb---sekalu.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d03e1a0f9---vedaxavozow.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d26bcbff2---tinofozojizax.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e05d9129f---notiz.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/81718341802.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/67ed1e525a95a9320e19e329b27f5397/rizejaxar.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160810f3e3eb80---kilawubawepi.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608030d0b743d---paritizurojokeretudak.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf484fecc---34372185598.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608963a4e5e2c---vavitulusu.pdf
    • http://www.bash.cl/media/file/gumubaxawoxabuvijoz.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee120b2f0c---22602446407.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=spin+the+lucky+wheel+answers+spring+edition
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db07.bin
9640e2eca8edb082ba668c18d51f9f37bdd6ebf1bd97cbc8aa4fb658636fb0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 5696 bytes

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