Malicious PDF — malware analysis report

Static analysis result for SHA-256 652c85bdabb8ca67…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 01:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a2fc96ecd97feeeecb38cc2a1cf76c0 SHA-1: 5e4b2bdce6e2bba5541b108206f3813886b06d1d SHA-256: 652c85bdabb8ca6766996bb47610a908d9985c35216fbb44d216aceb6fc03326
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/n8lm4i6s73ri8jp0ntje3h4k06/56989097555.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce8a198cc---niwabuvebor.pdf
    • http://piqiso.ru/userfiles/file/xalapuna.pdf
    • https://victorybear-info.com/userfiles/files/zuvadesikatotekaweso.pdf
    • http://hfnhsw.com/upload/files/26479564947.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608617067f989---56188863444.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a802085c44a8ae5e1cac0a5923dddf4/ralaletolujowi.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/47784392128.pdf
    • http://0-50.ru/userfiles/file/68072073707.pdf
    • http://assushop.com/userfiles/assushop.com/file/gopoxuzetuge.pdf
    • https://auto-rujo.com/images-editor/file/84319300393.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/gisoj.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848ade5c17e---nejojigob.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0047ebb629360ada2c1e0960ae9e7f73/febifidakavavogeb.pdf
    • http://shahinrouy.com/files/file/zapuxuneg.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba9464143---zajew.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee48bdc305c---66526973201.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2be70003---difuxobef.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210813_695A282EB61E2FB3.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1352757c3---zixufabejazavokojenamat.pdf
    • http://asbufestival.com/uploads/FCK_files/file/timufituwavusexejub.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986fe1917dc---zovaxugelepalev.pdf
    • http://clingac.com/d/files/20585504196.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210720_29F7DC866E300655.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/3b30r0t5q32mnqqbpk0oekbjef/26494210020.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/pogizenu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=who+to+call+about+traffic+lights+not+working
    • 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_off0000e6ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16792 bytes
font_01_sfnt_off0000ff01.bin
31aa8ca5e883407ed0f1bc61ff1d0082211b2a7c0d72272948d4fb6baba911ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 10892 bytes
font_02_sfnt_off00011838.bin
cab973ebb1c8db55a126e7ff1e8e02192af84b0326dab7b8d25d70d2abfe003a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 17848 bytes