Malicious PDF — malware analysis report

Static analysis result for SHA-256 5376875a02ebbe6c…

MALICIOUS

PDF

98.6 KB Created: 2021-07-13 11:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2ca53350b2f6e0fe68966023a58b3f3 SHA-1: fc7cb63f57dac68516c845c5013180ee8e4a1da7 SHA-256: 5376875a02ebbe6c89517bbbe32f292b5c2e3a2c61b7018c8014aa70f7ddb875
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of links pointing to compromised WordPress upload directories on various domains, suggesting it's designed to redirect users to malicious content. The presence of these numerous links on disposable hosting indicates a link farm intended to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4abf00d19---mawiwuletapak.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fcc5796c0---63945316592.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431072311c---31280668912.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607323661cb1b---xewavurilexeremog.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/nowoxukafojosoxax.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/nabisetewaramuw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc40610a---12696697739.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/31616261272.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5839a869aff952390ec1213cf0691111/95735957111.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/90453176158.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede62c9912---66460049775.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vesarawizavolixibevisoniw.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/wugidurugokubugapamitin.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8l027bljuk9irud1i6g8qoq2cu/zazepetegut.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608363d300ed8---sorijagirorigomulakafuzew.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528021644318919.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8456ec08f4f50eccb196397e63e96d67/99415693061.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/92444203840.pdfIn PDF document text
    • http://ruihuitax.com/files/file/79758105260.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/tesabofiguk.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f52af9d7da1b0100c57f96b0236e25d7/suluposujosudolafinive.pdfIn PDF document text
    • https://hirurgija.me//files/wegubovefobaxujexiwojo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/16470925435.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fc0de7be---kopedulikabaxolitonoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=holy+priest+enchants+classic+wowPDF 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_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 17684 bytes
SHA-256: 7aaf984d604a2c83d3ad26d34fd341e7abead97e4d41e2e8b9c1a1fe48bcaf23
font_01_sfnt_off00014cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBA 10660 bytes
SHA-256: 1d6a5c8680d1503747b2d99b3529cb2c74eaf237c3e959ae78f7a4db465bb2f0
font_02_sfnt_off0001652a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1