Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f867829342c1831…

MALICIOUS

PDF

105.7 KB Created: 2021-06-29 14:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 843b8de4ab5310fb39e1a6d9ea5952eb SHA-1: 4527bd8fc723dca2c456427a7031f13854a300cb SHA-256: 0f867829342c1831aa037e4f56cac5ebab6f29afbfa66b9391aa2d9568903887
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings clearly point to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://capitolmetrophysicaltherapy.com/userfiles/file/46621108649.pdf
    • https://whitesal.com/data/images/file/4995_20210525202021.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/236daeace5e5a71840cad0b88ea0cf5f/12095318168.pdf
    • https://adasms.fr/userfiles/file/bevutin.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c5d0d036---tipuwala.pdf
    • http://septumdent.com/img/userfiles/files/xilivubibexekutewe.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609193695a09c---12681118424.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/64173fb2746de5a7b1165561dec40c56/tapizakebafiboxikix.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/niram.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc0055b041---tonekaj.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5ge6i3t4i26upfgikq3e3jjlne/3657536184.pdf
    • http://ferrogep99.hu/static/media/file/petupisunalurafas.pdf
    • http://cloverdiamond.com/file/mopubavubukaf.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/ragoxawidixezili.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/25459924564.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/jogivozizexonowugerop.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/kqr1etbcjsgf86bh34v3d08puu/jakiwugalufimapulis.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2b8de5af74c8c5fb0c29d5265232af15/37082481976.pdf
    • http://lasfyy.com/uploadfile/file/20210623005405794.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607490b824c3e---rigisun.pdf
    • https://xo-sound.ru/userfiles/file/dewuwaso.pdf
    • https://eminencesolutions.in/resources/userfiles/file/regolatuteziwe.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ae43feb18b27c5a0589f1e5e01a6d0de/putinexupedijilupaduvos.pdf
    • http://houselandia.ru/files/24136457547.pdf
    • http://spc1991.com/ckfinder/userfiles/files/zulapotefazafabebirozap.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608086bd6495a---79030884552.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20da6c286f---77190419876.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=stay+with+me+meiko
    • 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_off00013ae0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 16792 bytes
font_01_sfnt_off000152f2.bin
de3409186a8b37ced55299535d28dd958e8297ec493f2eb2ca3bdf91e96037a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x152F2 17980 bytes
font_02_sfnt_off000180bb.bin
a5ec57b0eceb6cc27bec5fa9dc6416e8566480e8d3a6fa3a6a8ee19374e5ade9
pdf-font-stream PDF embedded font (sfnt) at offset 0x180BB 10320 bytes