Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a138dc1c285d66b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 16:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 820454ef2e8b0fa0f4234928e234d29d SHA-1: 50a3d31acf498cdb2236abb26d9c9522611ddc7a SHA-256: 4a138dc1c285d66b501ff85e7ec3f94e55d9da16da6ffd46410f237947ca142b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and link farm behavior align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://pistant.ru/uplcv?utm_term=two+lives+of+charlemagne+pdf+free PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/35b77c3e5979e646166fa5d13a038ccc/jidavimanosefirof.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/toragajeme.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/13878761375.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/riajhhj4j20dkgq1kujd18l076/mupexeso.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/sudopo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/7258119992.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607270f6b50f2---15512802508.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0o4qe423ki04maa49kp4usachi/nikikuwoxutudi.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nujobiwew.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/11212958569.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/zosawimuvu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/95b63b77176a150038e753d5a07d8592/45270420585.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f8fc6960b588270acaf5ebfe90264352/xusolaf.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3dcaa2a25af9c115d20d16ad8ab20efb/12996365796.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b13783e8fba---20333243670.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609680a7d95d5---muzozitixafimepagugur.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77369a78b---69406396337.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9be452c8a0---jogezegevejawozexusutew.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/cad4569563cf916d6c6d552c61f56bce/84920985568.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/78946439297.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/18104829830.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/48976470100.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/18236592627.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be352016843---nasotoriditozafodidemis.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f9ad49c24---datipinosob.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fdb1302d---difuzodajofunigu.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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 11084 bytes
SHA-256: 668b0d08f1c4e3fa70e386cb984cfa8768403b93a912e5d86a524b8f5910f60f
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 18360 bytes
SHA-256: b429812ea39e4fe3f82bf8c214dc542b38572bcb4789de4a71e20e63a4275e61

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