Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bf331c463dd0ee…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 04:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 829a2a6ba0a3277c18bc7fe8c7f81014 SHA-1: 0ad175dac556dadaf6ac6e2dfdcd942fa597c73e SHA-256: d2bf331c463dd0ee62bebfbf734eda026f662a6af8ed5d9db28542f5cee7817d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. ClamAV identified the file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=small+touring+theatre+companies PDF link annotation
    • http://consorzio-csa.it/userfiles/files/zatewig.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c849c3242c---94485424423.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/58620490429.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/polizujuxazetimogon.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d972204e9---gevutubarumusuxepozak.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/55544670674.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/senedemozomadeweku.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/13754676503.pdfIn PDF document text
    • http://partnercable.hu/files/fasumofinesibapobopojafij.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5233abf53---15806469255.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20211001011120.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090307105973499.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/70863196880.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vasuwenada.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/zozonoduvizapuwil.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/badusupojuvedafe.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/lipojogonalali.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2f94c5fc81a632854ad5ed985e3b3442/puvuwulebotux.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/lufanotumovoziwajuwuvawu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/nivasawibe.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109052110585779.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/debeminefal.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488a49591c6---23737482158.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_off0000aeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB9 15268 bytes
SHA-256: c86e636f969b3536241b810db6f70ff2ca3d991030ec65cb671743298e4ae3c2
font_01_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10996 bytes
SHA-256: f3d9b4707fb4d474bd9d11d86693d68e92b8ec5608debf9f0ce1476d6df7be73

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