Malicious PDF — malware analysis report

Static analysis result for SHA-256 790cddaf89fc74ef…

MALICIOUS

PDF

89.8 KB Created: 2021-07-02 12:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73e5764623ed45a83e8ee477fdd4aa94 SHA-1: fa27c5301acc5327691271e4be43bda34fe9223a SHA-256: 790cddaf89fc74efe800a088e7906ae5961051d90c69bb8c041eca8b191e4756
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://timebank.ru/sites/default/files/photos/pagefile/rasekesoraxumeluronefexu.pdf
    • http://cortabellanews.com/userimages/vepurumasofikaxetofizude.pdf
    • http://microcement.ua/userfiles/file/fegenipanajipawalimemi.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b62d642ad---mikeladevumolokomezo.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1a85c53a8283c0214bfd9b1908d95efa/jigof.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/runevoxosewizabibobile.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d5cb6995386f52eb0905ac90694081a3/xinowi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61f35728d---30595466709.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/9694175475.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6850970b---fuvupebuvukumor.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mozegawa.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b9bda3be7a09c28c49f43aabe51fb4bc/xofadedonuxulitogug.pdf
    • http://memphiscentral1969.com/clients/865565/File/wefarokumarudigumemoxo.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9d216eba84ec368ffccb4d531cefcaeb/jarulexewiwafalokokawu.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c718a35b---16230646062.pdf
    • http://christopherdallo.com/file/31527846989.pdf
    • http://hud101.vn/webroot/img/posts/files/munagaxigidesukiverotogu.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6012dcd819---95606551574.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2ef3d3567---99248934047.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5e8d6e396db533b3e8d4f78b82901802/tumasibegusub.pdf
    • https://sabagdasarov.ru/upload/file/4900851488.pdf
    • http://aryajob.com/user_upload/file/fimivejexave.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/04cd50f22a00accd9c811a4f1ec1b1eb/zememoxuduxegij.pdf
    • http://allycatering.com/userfiles/vovoli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=physical+social+emotional+and+cognitive+development+of+adolescence
    • http://medlab.webd.pl/upload/file/17531327077.pdf
    • 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_off0000fa70.bin
e365b4700e5887b5c1daf0b169f2f5c60e9bc9390827d5e618c113f7ffdf8892
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 11148 bytes
font_01_sfnt_off00011429.bin
3217f1b35b2cdf21e4d5a03f278a52670267766e533a9fe74847d8a4be68c520
pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 17436 bytes
font_02_sfnt_off00014156.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 16792 bytes