Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d546dd0817687…

MALICIOUS

PDF

100.6 KB Created: 2021-06-26 20:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dffdfa788202541e383627e472b8f903 SHA-1: a05b2de2e9b845d77c75e576f88257885ded4310 SHA-256: 4a8d546dd0817687714d2509917c6bdf428e2db2514a2a8c5810b3f84482fd0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8f3a08b9d377fd90f4f889ccf760da3c/podorufisimixumudivomi.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e160cbf9a3---nedopib.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6imlqfmdimsoovf0najmmr9l43/rubuvop.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab08dfa3723---sulovikonafuj.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/21df00e3ec162c0820c3907f373acd9c/guvukosodelibopubaz.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d253d82bf1da7ef04cbbd053641d2a4b/22499303411.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9e57250c---roxopiv.pdf
    • https://ideylia.fr/uploads/file/90712641148.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087abd5eacf9---jelefabitepabale.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/nikikodufidikixukediwowaf.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/80868586291.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160baae4c2f5b1---17553127005.pdf
    • https://247christianity.org/fckeditor/userfiles/file/monina1621466759.pdf
    • http://domholidays.com/userfiles/file/38362851191.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6769883209e6e456a241b6d6f8b8225f/wavulomafejirosix.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca42c8f60---39949007487.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608736ff834d0---43212512629.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/phgmga1n9159klh1i98qkpku3k/viseduboxalepomufuzab.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9b1147e6c2503c60a66d6310512c68e5/bofivozuxevafenuzidozuw.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160759a16d0a02---28704976047.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c89147f2946e44e4b722b62afd9197d3/sewopujowesopabedumetux.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/lotopubedi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+devil+all+the+time+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001248e.bin
70dfa483c913e82991561b991bdb39c3a41c7011a9a041402b88ec316290cfff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 18568 bytes
font_01_sfnt_off000155bd.bin
bf67ec2cf3d28498a4e6f8dc4a73d580ecba687918a81e1c383e98644db28b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155BD 10400 bytes
font_02_sfnt_off00016d3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3C 16792 bytes

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