Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f432b7a4080d2…

MALICIOUS

PDF

87.0 KB Created: 2021-07-10 02:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 861a10b3384d3d558973c736fc850650 SHA-1: c52e4ad8ebc14b2dec79c7f3e8673110550d58b9 SHA-256: 0a3f432b7a4080d29923744783ab3209da8e8b572ee1b65be2df35066843e454
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to manipulate search results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cfacgroup.com/uploads/FCK_files/file/14579127306.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609749042c16e---patixudisa.pdf
    • http://goref.ru/files/file/95498915506.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7vbold8as8d6mi542dis03anq7/tenebujug.pdf
    • https://betalinktech.com/blmedia/file/57427508279.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/24d55d566a8659467cca36b443a68642/ruzid.pdf
    • https://pasarantogel2.com/contents//files/64498703534.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e95462b185---91073766882.pdf
    • http://oishisushigd.com/uploads/files/92303200074.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1d3d0139---14377720322.pdf
    • http://dejede.com/userfiles/file/30108235968.pdf
    • http://goraku-sangyo.com/userfiles/file/83564710330.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cf2ac7d8---xubufux.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/67584918006.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bc7c4a66399c61cad52901f551ab28a1/30837421745.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cecc56413---65214226186.pdf
    • http://yesilderecine.com/admin/editor_resim/file/93097729030.pdf
    • https://cottonweb.net/userfiles/file/fikuwuriladariguwarejagot.pdf
    • https://securitydm.rs/slicice/file/xibadimexonaraw.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7dd377db5d59bf108ce1b091d298b3f5/59297910665.pdf
    • http://thsport.dk/ckfinder/userfiles/files/ribak.pdf
    • http://arniestribu.com/campannas/file/63919205331.pdf
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/47915031919.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad318c2cb7e---butepozigeredemegesozegap.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/25793816485.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+miles+is+it+from+orlando+to+jacksonville+fl
    • 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_off0000efa6.bin
2db1b830d11a0dbc05677ffe507b25fd3d22ba49e8f37f621602a13a00ed6f10
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 17092 bytes
font_01_sfnt_off00011c3d.bin
04cbcecc642184582d5e2e4e0c0c8ea018f39833d827669f9692a75952e1b0ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 11116 bytes
font_02_sfnt_off0001362c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 16792 bytes