Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6a05c2c035a112…

MALICIOUS

PDF

84.8 KB Created: 2021-10-14 11:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c83dd1db4132d404a10f44033ccc21c SHA-1: 79a2c4414f885b3b5e109d0bb60ad7ae47432e54 SHA-256: 0f6a05c2c035a1128e40e79f66242b3b6ae29d0ec03d4761cb946cb5f377dcc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm that redirects to multiple URLs, some hosted on compromised CMS upload storage, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/m72k8n3bt5c7gmbns6qbq4vur3/puwivexilusajavaxadebuxo.pdf In PDF document text
    • http://suurelepa.ee/data/file/wezeguzowij.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/rozagulazalalogukirun.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/65408250053.pdfIn PDF document text
    • http://fteq.ru/files/file/96098660174.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/wawapukuwal.pdfIn PDF document text
    • https://parfumzone.ro/files/file/mixatebara.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/82260207748.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/monunusodasiju.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/bexavutalalinofawafi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/12014481257.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/wewifowunejajiwad.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/bixoduwipoparoxukojipopo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1b90e19751b2a697f7505534e3d1f27c/tilujuk.pdfIn PDF document text
    • http://gyliver.ru/files/files/72694684733.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/60063d9989bded819a27f75bc4451448/18360298340.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/55808785442.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/99478294993.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615da208265d2---retuvedilisifegawus.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/97869853081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=erikson%27s+eight+stages+of+personality+developmentPDF 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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 11236 bytes
SHA-256: 5b11ff2dbf92d1b2257d6669abcbc0874f804ac4ab9c635d740ffd8e97b466c3
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 18676 bytes
SHA-256: 7973c17876deebc3c249c1cae010b45d2e9a9e6f79bcedf9732ed66e4041fb1f
font_02_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1