Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c29cbf81da343d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 01:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15243bc0e2bac390fec3404a7a9c13db SHA-1: 071fd34bd63e7dd5a949dfe32b44256028fd2c46 SHA-256: 26c29cbf81da343d814c76c2d9072a299bcfd73822621bfe976317fa62dd184b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues, but the heuristics and URLs confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=123movies+kimetsu+no+yaiba PDF link annotation
    • https://frontivo.ro/userfiles/file/95135917681.pdfIn PDF document text
    • http://fivelscope.net/fckimages/gifinozirenamuxa.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/86282586145.pdfIn PDF document text
    • http://megalaserasia.com/upload///gilanuvozejinojavobeboj.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/715427347.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/47636215334.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/50614695473.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/64081674524.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/10734271469.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pozanamol.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/muleponi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26e71e65c---xelebokuzezisixuxonisa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bb8e4d0d---66950923763.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/56700868232.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/67096011950.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7b5c5804256fad42c8d5bf6f83e595d2/nenojapagaserojuz.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/68112190543.pdfIn PDF document text
    • http://coumert.com/images/file/vujewo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7c882602---62896750417.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/dimozugulivo.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/gixenifakalexexesuxagiw.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/37027380185.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/torurafijepo.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_off0000c784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC784 10884 bytes
SHA-256: 968a6c3ef25aee85024a935b727cb402bab113e7274c4af5388688e0e970a265
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 18744 bytes
SHA-256: 428069773eccfb4363134c60498949b0e19008fe4f93a40383fe104b7c12be34
font_02_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1