Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7a66405e86ab58…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 06:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a291a814ca800bb3495b85a1370aaf3 SHA-1: 6324dc12dc5599ca785ab6183fb040a46be8aade SHA-256: 2c7a66405e86ab580bd664b46f854814fd190405a9ea89b5b1caa594af22825c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://airbays.com/userfiles/file/bawuxosironapirus.pdf In PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/pomusaragubixadotol.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/rexowuxazi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/29c4bac20656a9a3bc16f2131bbfffdf/wewenuba.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/zezegasabe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ell8tjvrk7vdt1hfjuqkp9m790/ruvudof.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e270f2a7c---66734060458.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/befuzibikagatopegofuzip.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/39321803449.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/83ginvoc14qadhqpin2m5qh210/38828743831.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/35268093201.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b52a541da---vajijokabubaxoz.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772df7d20f---51676835626.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bb8d3213---jopawidobizada.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/fadapunon.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03158270d3---dejiwategogo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/62996943508.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/949u7ee8h6q2hekn1dt9cucggl/lususidirewudujobukapoxi.pdfIn PDF document text
    • http://charontrade.hu/data/file/30430268890.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/moxezebenisukizujozagame.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/77012246104.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/miva1hba7nhe5uc61m7sdico8a/9015918590.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/84806f5b82130669897fd72050bcd19d/tivepa.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pipewifujud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cheese+corn+frittersPDF 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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 10256 bytes
SHA-256: 732586d335cc7a1159ef388fc38ddbedbbb8e5da08c6092c97c3a56c32df5a35
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 17932 bytes
SHA-256: e4af37fff372a515843fe93a62d7ac484a1f929f89ef557a6e8aad2dbfc138b6
font_02_sfnt_off00012ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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