Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d9aa38ec901ec5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 01:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ecb875961c3a19994fcc8710ea917af SHA-1: a77eb6f483ae6b326498b5eb2eddeabae37146d7 SHA-256: c2d9aa38ec901ec52d736ed623b8ec36e5c2ec1da9c06827fca984a7ef7dd79f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to websites hosted on compromised WordPress installations and disposable domains. These links are likely intended to lure users into phishing scams or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=reasons+why+13 PDF link annotation
    • https://f27szerviz.hu/upload/files/22248486716.pdfIn PDF document text
    • http://ndt-ultratech.com/files/85669663075.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5f6920fa10d945abcb1427622667b233/78280365331.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41e83ed7a---85315242818.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/borujapazulejore.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/acmiooilaebe3bva68s5cgv3sj/31360850048.pdfIn PDF document text
    • http://z500.si/files/tudejuzeguxadugozagi.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/rizimosuzejamuw.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/qu0aapeqvai32bn357pthd9pf4/76457477370.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f306201d8cf---tevasose.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/73775675908.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/wobewakibavekidazaga.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d007aa48b21---ganudow.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/62134239818.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a60030cbc---sevaxoxosabonimijef.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/72570252044.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ed1ab894d53e1669a6fe33431555c425/99019664232.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/vojenerabuniwulipifiguj.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/2175221102.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309440fd2b---66979161811.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/3714125807.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/penipo.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_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 10336 bytes
SHA-256: df3e8debd5982a2c2a5400d9c65308d48a44159cee9ad49305359cc2c5411e56
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 20160 bytes
SHA-256: 7e029741b6aa9bbfd3b7dc5d4d7d173bf3ce88625b28b9a048baee9be4fd3e85

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