Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d4485138a29c93…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 00:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd3cd7ef38344698b7594be4967d9f26 SHA-1: a1a10d29b0268448ba9dfe6b4a2c29fb720b8266 SHA-256: b0d4485138a29c9302f8345daaead7d99d280dc7cbfaef25765d54f6117a0c8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=piratebays+proxy+list PDF link annotation
    • http://ghinelliarchitettura.it/userfiles/files/42098400082.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/10501756810.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabunitijizufixepaxuzozi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/02783f534b2dbe76efc595fc59f7325b/73406812520.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/94697293735.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/69127379543.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/97456436446.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56093648829.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e741bff5d---12675669938.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/47849011557.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305cf41c49a---sirapigudoze.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/derabadapese.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38267400420.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/figuxod.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/50170560613.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16148eb86b94dc---gedafetopukapaxidisubiwov.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/wepesanagasozonasajegudun.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/xenufoxuf.pdfIn PDF document text
    • https://sentralperdana.com/file/97840882587.pdfIn PDF document text
    • http://446888.top/userfiles/file/73085883.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614115f2991f7---nikolafanixi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b523c813f3---boleduraludozazagenar.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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 10496 bytes
SHA-256: 94164a600e62f084ecd9093ad4d9d1c69facc9e2e6945ab9e3857e4710c49c3b
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 17440 bytes
SHA-256: 646d7962a9e81bc6b02962c740805ca12ad8734f0d167bcbbe723ba71a6d3b25

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