Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8e958fa06369e8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 02:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad137c896d788adc66e169aa94a46f5f SHA-1: 63e78b7f3f23fa889e32ec8fbb5de4448b57cdcf SHA-256: 6c8e958fa06369e828e682a414268e3585bf5c69c7376ad4412ab89dbc916e8c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://csc-021.com/userfiles/file/20210805230449_0xoywi.pdf In PDF document text
    • https://akamercedes.com/images/uploads/files/60134216647.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/fupagupepe.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/68657029320.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f7700d53---68187924694.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/43186659306.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c441ca99ec5---89826575789.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/da181d3ac88e2cdd93a72ee7062910eb/7071517445.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/94609646586.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a33b2dcf---tamalenadipewifarubelok.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b174cd9a0a---sudemawunijaderuzepatazi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a033ecno63s8h7a45cpiqqn1ep/74540985331.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/pifejafipegozilivot.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rpnnfdt1kpgm3ffm1bm701cabf/nikegoxapulefaliriganig.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/55123849022.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/54903411662.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/85536300987.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4522f16b71a3be3ac8772f80b2bece07/63433438006.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/44290103352.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/26335100133.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/tajiban.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607779683d31e---jufaxemijejimewatiradagi.pdfIn PDF document text
    • http://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/71818059128.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/rerevapamejokiwiveze.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612563dc7234d---nutujeloxiti.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8d40740482693ea8a6fb3afabe1ea874/47812445582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=simple+resume+format+pdf+for+engineering+freshersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 11120 bytes
SHA-256: 7a6f4d8e069d118ece8a84af32a089a1667bc8641bc7b9a0e63a7c87b84aa544
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 18368 bytes
SHA-256: d330f4f7ab8f741cac156c022ab6fcdfd0810f164e8e76434b4a6084a511ddd9