Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c237396b05fd16…

MALICIOUS

PDF

89.0 KB Created: 2021-09-03 08:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46c468351d1d34c9f45cba412cfc441c SHA-1: 5a3a8fb148a4c40260207df50022c4b014cd9d89 SHA-256: a6c237396b05fd16d11ce343a1ccbc3c4f28ae16d64b46de0304f51f7c463710
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with multiple URLs pointing to compromised WordPress sites and other disposable hosting, designed to redirect users. The primary purpose appears to be luring users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/5fccd069bec1a23aec67fc93a3c12f99/90391956089.pdf In PDF document text
    • http://101balkon.ru/upload/files/somolowobenutofibufalo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2a2adcf7---77943077941.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3486a35636---wolopaxusizof.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/60766484652.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb802e67a1---619275753.pdfIn PDF document text
    • http://belniig.by/public/file/91556439541.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708824aa30b---dawob.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/75452840364.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/lanaxuw.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/54812158999.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/169610801.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zukejebebazoj.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/sopokanalav.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/tenuximusedaj.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/litajepiwegusakibedo.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/69038659247.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/beab823f424a522ce5a091d3e8f6e820/46026056794.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/fijora.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88ed4df0d---guzokumotinanuzipeb.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/92411447657.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/lafazibeperidapelitubirad.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/5542139830.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/wibovitad.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/14d0ca163e91ce637b4fadde051158a0/lupunesiwepaxojav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=berliner+platz+1+neu+deutsch+im+alltag+pdf+downloadPDF 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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 21428 bytes
SHA-256: bd059cd2e550f229497cdbded3af259c1bdb78e0730a331a738d08e1c13523eb
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 11416 bytes
SHA-256: e445dab1f7b544fa250a91283630899059c2c712d62c27fdc3e6c0b9a3ee2aae
font_02_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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