Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3d0343f5174ed1…

MALICIOUS

PDF

124.4 KB Created: 2021-09-06 11:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b486303e6abfaa0e6c84b307a3e284b1 SHA-1: 5b2b4feffe8a7bf3ec5e51bc36925e182448b04d SHA-256: 7b3d0343f5174ed1a70a29b21a410548b7835c4c34c4f43e43ecd3f4b351eb05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://laborke.ru/uplcv?utm_term=apollo+munich+optima+restore+wording+pdf PDF link annotation
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fafa29b26fa10af3fdb60f5d162a83f/39532511266.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rafgjp27hv3pqr3po15hsk1gng/dujinofefadexa.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96ff30f28---fotatuxenogipikaduwodar.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/xizuzijusis.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/wanunelimiwovovojegigo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/cinl4bc522p6jg6sjdsasd0cc4/36186564027.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/85f01f486672a049d01beadb840b2cb4/23528455577.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zigoze.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134c30c03f1f---42207872470.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/depokesunomimobofu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c36d684913e---95112290010.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/butiratijozenuto.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160854c877c47f---27977441658.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/jetivetalovu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160940c896d1b4---33193880065.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/vatomuje.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/53638641967.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/91424057516.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/fubiz.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/86633129438.pdfIn PDF document text
    • http://schubert-hh.de/image/file/vubokemojunofebojed.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/faxalirabezur.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/pekaviboboximufovigofu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3ae3dfc7d---widosibuselixiwedaliviwi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0c46f864---73278385878.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/taxuvafod.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_off000175f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F8 21872 bytes
SHA-256: 5bbafb0ae43e73cb734f062a6119eaf387f13fb3eb692ee526b6e565e6268f96
font_01_sfnt_off0001af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C787 11232 bytes
SHA-256: fea640dc609be3bff81f6153152f7b8dcd653b2e02db3f3066a1a8aebd8d1f8c