Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93ad2f7500aa23b…

MALICIOUS

PDF

83.4 KB Created: 2021-08-18 08:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4cd3ab989eec6ecb2e4df6401870f3f SHA-1: 4735ed385078ade0100514b63bb27a777fec330b SHA-256: c93ad2f7500aa23b4ad78fe463012b2296a598931d823a702e1bac22c47b6194
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kog4hp57fj6kqmf1424sbvohbl/21052302114.pdf In PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/piforogoxikagaxikuse.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/55550648318.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sirimepegukam.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/7595380726.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f962b0c876d99f1093bc322dc2703f62/kawupunuzevupabo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f14905dba---43993808752.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/85476463416.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nozage.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bacfca733c3---42334509479.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wegidodamamaxesowatalika.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbc66b673---54629276614.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/83381311398.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/28191774391.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/39251752874.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/501680c9f8cbc2ecf34af493b967fa32/batovitonomavo.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/refekikefapobi.pdfIn PDF document text
    • http://minerva-collection.net/files/files/17467796253.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/57185568415.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/romeruw.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f074d119a8---42930258250.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/21920098332.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/duxupoguv.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kumumakupad.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103df5831518---3603945659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+4.4+4+kitkat+download+zip+file+freePDF link annotation
    • 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_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 17488 bytes
SHA-256: 441bde43c3f7b894c344624303fc8e5568a16ede189133a6eba03d94ff0c48a0
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 10684 bytes
SHA-256: 985378cea6c5206c8926cd35472c09fa8bfeb91a040d5da33eccbb2247e8c9b4
font_02_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1