Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2906da7ddc3b1de…

MALICIOUS

PDF

99.0 KB Created: 2021-08-17 01:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 854765febbf27fab3f199ff2efb755c0 SHA-1: bf47d8ce964ca20ef89f04f37e5d25d6079c1959 SHA-256: a2906da7ddc3b1dea4ef850f31c67867d4aeff5685661302e2b71f9d6892e844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=koikatsu+party+steam+workshop
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb8eea667---78857196051.pdf
    • http://lacasedescaraibes.fr/file/vukore.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/21d7f0c9012fd567e8d034697861d02b/66174974422.pdf
    • https://candbco.com/ckfinder/userfiles/files/jokomemekuz.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a530dc2cabb---dagobidegekiletaroxisut.pdf
    • https://stvorki.ru/files/file/38312339952.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8e442213700124f0b9d1a0dae1afc2ea/xigumi.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed53d3555---morigejubobojekuze.pdf
    • http://cancercareresearch.com/userfiles/file/68939776777.pdf
    • https://dadesigning.com/daduserfiles/files/tojidotemuluzu.pdf
    • http://tunesistudio.eu/userfiles/files/dadidivitubaneses.pdf
    • http://twfindia.in/userfiles/files/82860047831.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4a8dc775fab803372fbe5867e77e4df9/wadavivimadigeferokol.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/subisun.pdf
    • https://nffcd.org/userfiles/files/jitiporitafawupisamusofeb.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9j5slf1d8v4ihvrobvf88pam0l/wubikuvupowab.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9b6f3c0e61f9944d40feaa7db455ee9/vefozolanasaxe.pdf
    • http://andlupa.com/userfiles/file/novigadurilimapob.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2ipefonh0rdvnvk9kk9ihnv0u1/tavokoteminubibub.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161178e589a436---98988317926.pdf
    • https://bdblue.com/ckfinder/userfiles/files/1869095403.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cdfcbb69---41509663339.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_off0000f5e6.bin
a557d78130bc926e3f1f670310cd76320af67d2974c592ed9243c1aa80a1ef3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 10748 bytes
font_01_sfnt_off00010ec5.bin
fbc66f93dcafe56b41c367667b9ed3c094fb22c46cd1f92347cc3546bb5df44b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 18292 bytes
font_02_sfnt_off00013f77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 16792 bytes
font_03_sfnt_off00015785.bin
7856bf123af35099c0f4eed0666b2af256bb84220a0eaa69110b0b7721252b08
pdf-font-stream PDF embedded font (sfnt) at offset 0x15785 11064 bytes