Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de25511e42466eb…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 17:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b48198ad82b0b044a0a9aa34e7e2ef5f SHA-1: 79156c60b1246e42d27e2691235e1bb970a368ad SHA-256: 8de25511e42466eb51241b76aa5d78301da390dfd23aaad45b46ab0e45e6be13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised CMS upload locations, suggesting an attempt to host malicious content or redirect users to phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://sokolzgierz.pl/web/uploads/files/43220056589.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/80917e08b1e69230a8d89a3a2e821036/41429377115.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1886837ac27b361c7686560129eadccb/66159460827.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd6cb7d0b7---zazowuwusikaju.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd3f8c6272f7528adecfaf6a7548dbab/jezanipikopapanusodizulin.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/miwajaposerotugatowoli.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7njpasnf81q9dk6nmok4gqrmu6/94145194751.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/c5o8e6fs9br4tu4ajtu09si81o/68048358028.pdfIn PDF document text
    • http://ashioke.com/images/library/File/82669388439.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/16651649627.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/649b1f71efe897bb570b666931a3d837/32670547954.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/duxejezipusevexoxetidagi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa57e8835de---92423276372.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/musisixinufidif.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b7f54719f914c0b27ff256333d41ba1c/92434094292.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c3272feb4633c183bbe7a1d7a42ce51a/21271441119.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/27ba32266f3b4260d8fada14b64611be/leliwafonolasipaxazugoduv.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k5v00acbt6d1bhfiitbept8m8b/mawatubudimubabozolu.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/jibiwesirazemeditanoga.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/wigabemupidewepulep.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8ddac11308fb514fefb8eba0b14d852f/56757654781.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4qa6ugi7vjv654cma254e1mrc3/89663486282.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/25153237704.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/l8nqkh076na7s78etmmf0tel3g/47098200072.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56n8kansq5uujgqe222qijtvfb/5466491495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=if+someone+take+screenshots+your+instagramPDF 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_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 10992 bytes
SHA-256: b1069336334d33431d353f5def492e6c495b8a199d4a6640fe555aff21ac5321
font_02_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 19384 bytes
SHA-256: ceba6d7fffb6fd7fb673f4081145edd6b3ac452ec55b60a75ffc3b12fa671377

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