Malicious PDF — malware analysis report

Static analysis result for SHA-256 1291572f126e3371…

MALICIOUS

PDF

110.9 KB Created: 2021-06-29 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5613fead7720e63083b9eb345e81bb2 SHA-1: 03953194b154930a8fdfe3bee279a62ffab3712f SHA-256: 1291572f126e33714c5b8368df380692a5cce5cfe5e5c062c31b6fbc3ae019bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=class+10+english+fire+and+ice+mcq
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fbaff60022608f9063d0141b5382feab/30531222902.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/20901ca702cc5762eb7be942977fdcf8/6239829212.pdf
    • http://av-jet.ru/userfiles/file/vajaduduxojavez.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nukamibujel.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/09ftim8sgodp4750taa74palbo/49664006593.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c05685a2d2c---dijubunedaweza.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/dorivipilodiso.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i4uu7s5it5ukjtu7d67pbeshh3/diforerezeki.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d79f3a97---45256925228.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/49460843779.pdf
    • http://gsxr.hu/userfiles/file/zojigofetisasibev.pdf
    • http://beergolfers.com./blog/images/file/xobugogufekezujinivewi.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/32b1dac8145a4b640f17916f97390d03/34458561173.pdf
    • http://alexlunacoach.com/img/editor/file/kupotufowarimewu.pdf
    • http://naviway.su/upload/files/zinuxunoj.pdf
    • https://inverpalmas.site/aym_image/files/nalejukegepavopidusefedig.pdf
    • http://yesilderecine.com/admin/editor_resim/file/9476518806.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d819925786dbe23de6331bc9cc868c60/91044875978.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/be5mf92m99pf4nhisr5huc2htu/remoxilowawuxifapikabi.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/33609462981.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6lsvrb1valn128gncv518gu41r/72656267822.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/bugetomedugomozamegibi.pdf
    • http://heyumpnd.com/userfiles/file///92836965916.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c8236293f50a5af5a8aab0073440e582/sanarizeg.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_off00014f80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F80 16792 bytes
font_01_sfnt_off00016792.bin
5ab30160a455be37ed96301cc4f83951c36134a4633f4b6f8da8023138a4f01f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16792 17620 bytes
font_02_sfnt_off0001956c.bin
6d2fed52ab8773bd6840c7687e73c994369b8c2839b00b1a2ee91193e27e38e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1956C 11056 bytes