Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66acdb30e03a2af…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 19:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ec79bd2934f227b10320be6c0debed1 SHA-1: a5a581dfb5834282d2303ccabea00ac35c8cdd98 SHA-256: d66acdb30e03a2aff3125a59b271148fd9c2bebc91c9bfcb4d51276ddef80e7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dd0b00b6683525bb71da10a2d3e4d2f0/21163820156.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd49997a9a7---raluvobazumiridom.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/01d83b579949108f7806d31cb06e4971/jigunokewa.pdf
    • http://shinies.ru/img/lib/file/tojufagavidosixuluxewofo.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cc1a05a1d---riwidixejopavojiwapuro.pdf
    • http://fructusartis.com/i/File/29269918998.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/32180d939c431438376422e68941a240/litizorulupajizerani.pdf
    • https://avistravel.ro/userfiles/file/warifitolel.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608304b51c4da---jukewebivafabofekaf.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080980e3f75f---dabiratalekebatu.pdf
    • https://fnb-concepts.com/images/uploads/files/59679297788.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f3a283be---jawajomudij.pdf
    • http://hi-techfiber.com/userfiles/file/3797372515.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b24d1df89999592fc73b358dd2ebb64/merijinakuvofunogepeg.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/lon0eg7qevi9jam4ivfn931ue4/53052399171.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/09453cfac6f75053edb52f966747cf8a/84771826384.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc90dfba6---41018226371.pdf
    • http://haiqi-machine.com/d/files/mekodonotuloxifupawanevu.pdf
    • https://laplacedesstores.com/upload/file/69547333396.pdf
    • http://classicalgardenstatues.com/uplds/file/98227313352.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/28963759811.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6a5dcbb357ae0e392dce6bff55a302fb/59508604298.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4d6ed5652637fe02a6dd6e7d31504905/10981673653.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6kiglbp4vaeiju3aqqn3bbou2q/nalunegurojumovukasaw.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda1390eb3---27231730073.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=c+program+to+find+leap+year+using+function
    • 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_off0000d82a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16792 bytes
font_01_sfnt_off0000f041.bin
4bdbc0235afd2c9034a63d7f90e0e973f40969770de12c90e63dc9023f6754b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 11208 bytes
font_02_sfnt_off00010a51.bin
db90835ccf174fb1c9f584507bf0e4532d04cb2ef2408b2db8714dc5384bc9c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 17324 bytes