Malicious PDF — malware analysis report

Static analysis result for SHA-256 d765460b03eec267…

MALICIOUS

PDF

187.5 KB Created: 2021-08-09 23:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edf0f5b1d58b4e9ddabfdfd0a468ae88 SHA-1: b74f8f48bb47102e5f4c522350b753e39aced716 SHA-256: d765460b03eec267471d689cd8d1e8b8f0bc8938dbe8f6718624c26f55c8b4f5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised WordPress upload links suggests an attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8660

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f1c1b9496c1eceb94ae2f849c368d628/vejojilejako.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cec6b5a68---tuturikulukavupo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/4723783317.pdfIn PDF document text
    • http://com123.vn/uploads/file/wisefuzorexizon.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ec0fce851---piwalekuzako.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8032e2e798---duteronakisabiliro.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/kebitifedose.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3be48cc1315196692b56ea32fea25621/verudijunabakexaluriwotum.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/sumasukagekagaxigipadag.pdfIn PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/bodiwilene.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210528101335_202301977.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/726450fba9ca7e59c4cd174bf6c975b4/duratejokuxepegona.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d3673d8402f856970bd6a96537b7d63d/vosifovatepomitopi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772434aab1b---33945490763.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/93632814238.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/fbba96b90926c6f42d11fd1e8d926b4a/gatotalib.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/387b6fae2c804cf5872a2ecda7f6fd31/gabuzinemavefivifelatoj.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/20214045607.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4424458bcb0b289adb0587e3c6a1eef6/15439085948.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/53547673552.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57e6a409b---3048934902.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/46011672308.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b1f0f6atrj5oqn925lj18ij005/43090943544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=origins+lightning+codePDF link annotation
    • 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_off0002a46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A46C 16404 bytes
SHA-256: 9514a9f0887807e6637805c2547811e24ae01924532f056d6650c53c1d5e71c6
font_01_sfnt_off0002baf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAF7 10512 bytes
SHA-256: 3aae87839a385b3f1fe623aaaf128f18c86df079eb6cdf1bec4b49be73326c04
font_02_sfnt_off0002d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1