Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c23debc0ed29e0…

MALICIOUS

PDF

73.7 KB Created: 2021-06-01 12:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 666febaf860afb282dd5822dbe64b468 SHA-1: 7b66d8594466ce9f8f4f11f6dc2887dbc9eef368 SHA-256: 64c23debc0ed29e0ceedc8c22fbfcebab3468d5e9ae09216fc9cab5ec7e8a882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or host phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://logo4you.dk/userfiles/file/47631406610.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e1b2f7df68300c2e85d85b08d04fbacc/18730309060.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/badf4dd114a02efa4db6fbdbb8ae7595/55287854487.pdf
    • http://rafaelokazakov.com/file/38156841427.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ffb5776d---94970238532.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607683399f77a---linej.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/eb547c078c5e6ab4c78d321dbfae671e/vopuzisisigek.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f338a266---sirefirasodipu.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf50b7989---leluzufaxinorunisowis.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/omlei9rdq03n9o4tdsv6fs0tqu/254491930.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829e508bd08---wugarexisimoluziretewu.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f292b7e2ed235473dbc6add5966fd925/49393194562.pdf
    • https://actor-conseil.com/files/file/64328513095.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4nmcbu13amq1sq31sch62tbdan/48827918242.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gesti%25C3%25B3n+estrat%25C3%25A9gica+del+clima+laboral+libro
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d260.bin
9049ccdd7164482e629ee986889c8b4268c31fff43c1b76501893351975d1e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 5496 bytes
font_01_sfnt_off0000e469.bin
ebd18ea831da942e3ea495abb07cf2203a10e816e29cc7b19a7d15e1c65f5220		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 11428 bytes
font_02_sfnt_off00010984.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 4324 bytes

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