Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0087889b53a544…

MALICIOUS

PDF

164.2 KB Created: 2021-06-30 02:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8b04ce3820e88c4c6d1e89292985e81 SHA-1: 4bf6e9bb27aec33832b534bb2d94e487b4601e1a SHA-256: cf0087889b53a54479699ba3ace9f20a040abdc0111f42345898b85e8eaa0726
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9722

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chinazzjx.com/d/files/56068839723.pdf
    • http://banghetretunhien.com/media/ftp/file/84760046168.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/temodenam.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199f4d2062---97072096060.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706127a679c---93871391336.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/49f35e87cecd6b8d8cad60279e5f5c2a/pufusijaju.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095388d84dcf---40151021057.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9401598d6cb086ff629d6d10f6f5524b/vuwaxen.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bd21f621ddced09a48f09679b254400f/gelovuzukenoxovufirofuzog.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/io7gl8n8hkfkr9e982mp6h8na3/nerevadili.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/36826245898.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/84a936f0ac01275be802877fc2da0f03/bezaxozobuzavetimugozilam.pdf
    • http://www.yoko-ono.be/images/userfiles/file/jawiduxorujev.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc70303a0---nazexevurew.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbc32f512784c0c4a95b07e22eb67e11/xivowigumufadurefuwawulol.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3d1a126acfc15b87b6d7ef207f6428ff/xufukomujuligaxidasujoro.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9d2bd9ee1ba0012415d5b815a156ab81/22776089276.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/8bafc3825e349e21c05f7aa36c7b941e/44172632943.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ce91fa3f---suxakoxonidev.pdf
    • http://premium-t.info/files/files/92593972507.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608928c83d441---67727298979.pdf
    • http://beautybybelief.com/admin/images/file/66641572825.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824652a01d0---78600170456.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+48+laws+of+power+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 16792 bytes
font_01_sfnt_off0001263a.bin
68144115a836aeeda2ed681e4ee43bd0a3791d061fcfbb4242172d6929864e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 18236 bytes
font_02_sfnt_off000156ad.bin
fa8737359b28c808398f2b05ff8ea9f2462e06c6cb753325814239b9e5fb89c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156AD 10636 bytes
font_03_sfnt_off00016f48.bin
8fb0abc17c9cfadd73b0e6bbf22d37c6d27662c3fb2169409ae56a267d52c820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F48 109440 bytes

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