Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8932049c56e219c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 22:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 734392d37c8bed8267053949b985e1bd SHA-1: 64d81d521807bf91c8e646b399fc12c62b6ddd7f SHA-256: e8932049c56e219cf958c8be0aa2e14091df9256fd0d9c57463fbd977b83bb33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports a malicious intent. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=free+100+likes+instagram PDF link annotation
    • http://indianspringhomes.net/userfiles/files/89660734811.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/96015830898.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/mukigivofuxab.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/vuvonox.pdfIn PDF document text
    • https://armenia4d.com/contents/files/72055750752.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/vubetudef.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/vofivo.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/35680451021.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/37071714338.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/sowikup.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/juriru.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/11562119618.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/xorudafekirojuz.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/48740925850.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/89411491412.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c55c132403---54688670453.pdfIn PDF document text
    • https://chptravel.ir/data/file/8275561314.pdfIn PDF document text
    • http://grimastone.ru/files/6372537802.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/99171129345.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa6e2c4f7---36135637232.pdfIn PDF document text
    • http://fivelscope.net/fckimages/pomirux.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/87444128853.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203bd16c36---mowetifajikola.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8ba702bd91f2a5680284b75d514d0ab0/49583062417.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/xaxawaxedisiviligodumod.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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 10576 bytes
SHA-256: 2e92b88f1606b6198e4b11910df72181186e5bb2aa941d63739ca86a4e4c03f9
font_02_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 18388 bytes
SHA-256: 34a2d1391b0dc1c1b263de2904009517205595c03c77c081b2b4d699f9d9cd02

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