Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61906b4be91bd81…

MALICIOUS

PDF

96.3 KB Created: 2021-07-05 09:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4f6d3dff735fcc00a206c215a02d249 SHA-1: d1002af28faf364b48c5a147aa1779a16fed86d7 SHA-256: c61906b4be91bd81cf97ccd20a333bc15af3b4983ee555ec373c32e574206369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of these links indicates an attempt to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73dc6a5b2a---tizetikevugawofavekodugo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e382287e78b80e87e4817124eab1c64c/20933330164.pdf
    • http://gelikonline.ru/content/Files/xowaligotutodolipufavez.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/81c1cf7dc0026831f60720b7e2026d18/vonib.pdf
    • http://adhdesign.de/userContent/files/20210630131641-povufezenoviv.pdf
    • http://www.asap-recruitment.net/upload/file/teveniwilumevunigexodojox.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/13f274289b5657ec49f4d13301624565/94540464002.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/03qkbs91umid7mfv1vd2isir97/74204149665.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6ffc66d9cac65295d4823d5918eb5700/pozuwokanevefilijerubanu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a415ca7dae3---60881388028.pdf
    • https://dpengineers.info/admin/userfiles/file/bojel.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68d5df174---12642637134.pdf
    • http://www.awakohchang.com/image/upload/File/ixemelomopevewanovofam.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ba7ad478c32aaec20ebf7630557db99d/bifaferajabivixas.pdf
    • http://automotiveenergy.cz/userfiles/file/kusejafufasupediwi.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/75834332927.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48e6b04f1---76011708925.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a756d05384e---7336646079.pdf
    • http://dynamic1984.com/user_file/file/69604520189.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580a47b9d5---62967481553.pdf
    • http://erdbau-rauch.at/71181042155.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9104362d34---87783789472.pdf
    • http://rld-carbon.ru/file/vadavurazazonukupo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=intrapleural+pressure+and+intrapulmonary+pressure
    • 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_off000116e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 16792 bytes
font_01_sfnt_off00012ef8.bin
d0525076ae6fd022b3aafd5fe4d86f9633ebc9932c97cb82155347a52a8a4f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16628 bytes
font_02_sfnt_off00015969.bin
bdf055f96e36278787ba037d42d05aa2c29cd9aa9a1cbd4629e1dfde5c2259cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15969 10716 bytes