Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c13506504b4fc37…

MALICIOUS

PDF

80.2 KB Created: 2021-07-02 10:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b884c715d9ad91663545ea48abb15b7b SHA-1: 3312bb67a01a7255d4f3309e6f3e7adef5b0c5b0 SHA-256: 3c13506504b4fc37a53f522332f5d58e4aaa75ece48fc1dd0f73e5a2adde237b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=convert+pdf+to+word+online+ocr
    • http://studiotravenzolo.it/userfiles/files/zipewuxez.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9558026be850df7ed34eac793eb7566b/gizuvakadedi.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4460ca42047d1414fc867f71c02fd81f/4424110421.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c491f6e65c8---95447255683.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/rokegidaxizilapobemuba.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/mewajonitovupeluk.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d3356eb05b3673276f7a2e58131ea491/ribekuruzatarodinakeralug.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hgaigd8geujs5k34dvhn4ug5h7/nesune.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/38bce04919ab6925f475a02fb536ba11/nediw.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9er3i6nu9qqjtfq0n8a5qoqf1r/99478609254.pdf
    • http://stpatricksreunion.com/clients/84553/File/81343618121.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b787cde4d---dozikat.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/26b6147u8a8paga68vnc34llr9/novofut.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89db64588b---tufiz.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ce356de---54344702640.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b80542a2872---61758791709.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edbec5f16e---xakolanab.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeef263095---gidakezidali.pdf
    • https://muratay.nl/userfiles/file/kixajaraxurene.pdf
    • http://driver-jazda.pl/upload/file/benuremeporikunatibudolal.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3c9d80290b5132d833c26be913900435/refajaxanonexigipa.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ffc62267f1a46ddb201e570b9a0cd139/tusav.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/23766152863.pdf
    • http://congtrinhnhaviet.vn/upload/files/93735013418.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160703d84268b1---pidirewogujojujevajo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ee.bin
024c78f900c4395523f37b981992b7005474b044facee006f4d8fb11f9db6a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 17064 bytes
font_01_sfnt_off00010355.bin
6ed6882ff492a2c53a9acf0bea7ce70e8bf442ac1edfda4e29c276f2d740eb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 10468 bytes
font_02_sfnt_off00011b46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 16792 bytes

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