Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4df579da8afe6e…

MALICIOUS

PDF

85.6 KB Created: 2021-07-15 14:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92be52e0fef57d18a2d3e764a512f4d8 SHA-1: 450b17584a377d375c39433240bf3fc6a03fc129 SHA-256: cb4df579da8afe6ef88aa6fa971b4633c30b198732ab71069766095f18dfd288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/732e9f3457006e0245e32841b984b64e/44850157093.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/805238eda85ee8f4778732564e85b2f9/nixoviziganagajifibisuzu.pdf
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/mejobiguwokazuzuwef.pdf
    • http://ya-ke.cn/admin/upload/33995062222.pdf
    • https://go2germany.ru/files/file/gudazi.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a051acf---93664817211.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e0refubaujd3qabdsmt95cjtdp/rigavopisokaxamafutav.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4ntjl00hugannnft03mscmnvh3/datumusapafedemaweguta.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4f2ff7f2385a383ac68486cbecae4749/10949530910.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f6539f65516d759653efc80e7e655daa/mejarukuzefowigupuro.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4938fba21b029d94db3e270fdfd66e76/28355773599.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b31185fe---6255794932.pdf
    • http://budohurtsa.pl/userfiles/file/92282265180.pdf
    • http://arch-teh.com/pic/userfile/66940054119.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d43ca49a60---rezemebuzatefuzu.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8c546668e819bc6d58045fb4d2ddebe3/muwek.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9qn0nbsel7pjnahse15ersemva/pofukaxizofaniseropufeni.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b0d36a7da---vazuzapezofuwepipofit.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/40946895893.pdf
    • https://gymlesgeants.com/upload/editor/file/jokerigupuvigemovomevusaz.pdf
    • http://www.aqsclimited.com/EditorImages/file/58424824216.pdf
    • http://gat-asset.com/CKEdit/upload/files/13759944909.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/odtsofm5o1mlqtu325b15fbelo/14416038058.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=srimanthudu+songs+download+mp3
    • 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_off0000eaf3.bin
b9b2d490cc4b2c6cea645215211cdd5477cd0412f013367a9fd9dfca9f77abf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 11140 bytes
font_01_sfnt_off00010491.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
font_02_sfnt_off00011ca3.bin
5340d3837e34dbddef8fc7125205f5ed53034df11f28e33725d34c50103be389
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 16936 bytes