Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80f6508b136f2b9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 05:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4895709eafaecc6efd98fc0932a77a88 SHA-1: baf140b33cf1635b4067a39a7dd6d44cddccc836 SHA-256: c80f6508b136f2b9cbc906998e80bf39b55a5c2d4675c4f87c5b3701991bfa51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. These links form a link farm, suggesting the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=the+four+personality+types+pdf PDF link annotation
    • http://olddieselparts.com/ckfinder/userfiles/files/86539338528.pdfIn PDF document text
    • https://angkalaris.com/contents//files/20097449861.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/63592119986.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/jomuzebikujaremuk.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/pt3ru6f7n179lrk1hr5008h556/85749513077.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/7426359628.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/fexuz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pbc2gsu7aodqsln5g9142s9v55/rogavawedutudififelol.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/67182017170.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842371f011f---zuworugalegakomowob.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/54550107127.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a7a1e68d25c809345ee1505ce554bf7f/xideris.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa6dcd6a3---tonudarolilekufinagudet.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612631654f4a6---vowol.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/varotegan.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/5307447357.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/xutonekuvepawupabilatadim.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27171f134---degarisolerum.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/jalarezevujapi.pdfIn PDF document text
    • http://artospace.com/pics/file/sodifevis.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/34770338850.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/33137868333.pdfIn PDF document text
    • http://protok.pro/upload/files/45568664606.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vadonolidewiwigunomofiru.pdfIn PDF document text
    • 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 10772 bytes
SHA-256: 469996ec189a9726054d8be0334cc23c8be68e2d0d64c565bda10ebc659c7166
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 18236 bytes
SHA-256: 34484613e9bf2af38e9ac2d213df4858c17fde51afeedc8332cbe8bc58287dcd
font_02_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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