Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc772333f1d28d4…

MALICIOUS

PDF

76.7 KB Created: 2021-06-29 21:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b99d7ffef2b9c55797114c173e47fe SHA-1: 3297f113a320aa3f65c4af8cd0e5efdcffcf37fe SHA-256: 6bc772333f1d28d431aa2d8732234b0a4130018685abd7bdc2793c62b47dccff
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on compromised websites or disposable domains, indicating a link farm designed for malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious with high confidence. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://avsa.org/sites/default/files/images/files/90148271892.pdf
    • http://quick-thailand.com/images/uploads/file/62956385654.pdf
    • http://antifftech.com/uploadfile/file///2021051117012132.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0865d89d830c6e1010d8b36cd2fc7fab/39562743877.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608504e048d9d---74251143170.pdf
    • http://cybernet.asia/UserFiles/File/wugufuzofijekaribotexego.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732ccbcb93e---xafurudebixuk.pdf
    • https://binarbaid.com/public_html/userfiles/file/8275511398.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd97674a29---9945103739.pdf
    • http://amandamaitland.com/images/file/limobol.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc6e99250---11052113494.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/iin6jiicvm6tl2te7h697afah5/51906732141.pdf
    • http://texmet.pl/userimages/file/ponakesoroziroguxevezu.pdf
    • https://summit-christian-academy.org/scauserfiles/files/notudofalevuwubab.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c85b962c051a778166ebd2052a907872/48997695995.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb720497ff0---24053754033.pdf
    • http://seednseed.com/admin/fckfiles/file/fapezabajuw.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae383e1d65f---9875610025.pdf
    • https://anthonygillant.com/userfiles/file/tesepexelulovebisuseneni.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a678b5dc837---17800235137.pdf
    • https://arrayamed.com/userfiles/file/pitun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cosmetology+beauty+college
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca6e.bin
f0669658f12646eb7e0759cbf32baaad8883b836610b6a792137c681d8a474a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 10660 bytes
font_01_sfnt_off0000e302.bin
1e97381eadccd96e1181e59cfc1fcf41ea7c5cff12febcda5ab7c95d4f999a69
pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16556 bytes
font_02_sfnt_off00010e0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes