Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efde71f6d5f3980…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 22:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 840289efc2c2d83871548f151a04df5a SHA-1: 34f8378072ec075322568de82f4da7f213d2e685 SHA-256: 3efde71f6d5f3980b3bdeabcaf74c6466556e8fa66b67f3bea57fc9fb2b5b405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and the nature of the detected heuristics strongly suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=descargar+juegos+para+adultos+apk+gratis PDF link annotation
    • https://dwitunggaljaya.com/sitefiles/file/reposinetefigevufugikar.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/86857276821.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/48287897483.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/07397f0bdc30cd57c5a034896114d86b/rixurore.pdfIn PDF document text
    • http://demkapi.com/resimler/files/67767908201.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/93695059333.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kijol.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/xupagajar.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gipuxofi.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/30903728191.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a53f20718---22640805066.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b2d1f3b7---62123559674.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/22776058102.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/32945110721.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9a744d51425f1c071ae90f904deb0668/36676356271.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/62849683582.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/67381572383.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/33282538288.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/23874542626.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/vomodit.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/21768817223.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/156f52145d4694c8e67e4c693a0f2980/safukajenas.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/89499389810.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/28611452319.pdfIn PDF document text
    • 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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 10908 bytes
SHA-256: 74966bc88a9fcadf4e696ada7a0a3fbe77d151c80b7683b0f25e7b7f309cb28c
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 20360 bytes
SHA-256: 84ae99adb1027526975e8eaf443a9a2db48557eff788b555992caf4e72b52487

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