Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0941425ed03fd7…

MALICIOUS

PDF

81.6 KB Created: 2021-08-28 21:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec3a60bfb1058982ff5213e8b6566786 SHA-1: e2db859b500166244db279edffe6ffaf26211ec7 SHA-256: bf0941425ed03fd76039772db08071254bef759d763f2a61bb3b63d6438fd821
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inwebjor.ru/uplcv?utm_term=the+book+of+iddo+the+seer+pdf
    • https://andana.us/files/files/ribegirokifitomimaw.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d7bbeba9---fuxijulelikogegug.pdf
    • http://stevis.cz/files/file/82591808263.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca29fe9e88---30759208352.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cbabb626667b0fe0b897846950a1df7b/kilogak.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/65801730204.pdf
    • http://cadelupo.it/userfiles/files/86229162589.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6ccbb246d4565341d37b9067ac68280d/jazaderawipejoledujezev.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/95241973028.pdf
    • http://luxe-pools.fr/i/File/53766040158.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee50651a0f---somivizofukegonuz.pdf
    • http://pappteam.hu/userfiles/file/betoluvitafavabekevipali.pdf
    • https://appchecar.com/ckfinder/userfiles/files/74029605388.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d13bdc88e---47664040957.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/76e560d8c1a370df913f3fce6d804eec/82902110653.pdf
    • http://chemonova.com/FCKeditor/file/mivupitulatoramex.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f79b47c7---xidajutuwulasetobeb.pdf
    • https://promtong.com/promtong/temp/file/39987965488.pdf
    • http://fitviewer.biz/files/file/60789251552.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160975b16d167e---mefuveleniwesaw.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5c7e2079da7272d00b3d08f3731d9dc2/7756497989.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/rtgdsaocq9i8s4scnotksuqlfi/kigeletidapuxonafixovira.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n19mbdqr6b6t52lrf1ie4gqm36/6917788996.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a10c2dfb95ac4b022d483bbcb0a3914a/fojigixun.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_off0000d6a8.bin
0fe2e1ff8ebdd3f70fae2c6d3eac96f9bc1370d217637f11690cbf30d71143ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 18904 bytes
font_01_sfnt_off000108c3.bin
d024b5ab55c706ea0ee65e121e1883884e432247eae1411d42728b1eb677f7ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 10476 bytes
font_02_sfnt_off00012080.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes