Malicious PDF — malware analysis report

Static analysis result for SHA-256 636fef1f14a72d92…

MALICIOUS

PDF

64.0 KB Created: 2021-09-05 19:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9a0205e2b2e57abde1bf3d5161f4341 SHA-1: 96ff51f8be5407699a2366c542912c17602b7fbf SHA-256: 636fef1f14a72d92ade639cc2b0a4faa873185caa2bc0f9daeb28bd23990b39a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of external URIs and link farms on compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=logo+design+client+questionnaire+pdf PDF link annotation
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c024ab9a4e886f43928492ee580b675/35761409446.pdfIn PDF document text
    • http://lg-palette.com/upload/files/xisazolukelotekawotigewi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613e713ed6---48685048639.pdfIn PDF document text
    • http://innotack.com/userfiles/file/kolugojet.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/46493956033.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ri27klgfd8nkuko941bh50quuo/funiz.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/17531214768.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/52741023629.pdfIn PDF document text
    • http://sksound.com/userfiles/file/39698869053.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/tidod.pdfIn PDF document text
    • http://k1a.ru/images/files/file/visufusupada.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/2817871368.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffb75b3c3---65923267118.pdfIn PDF document text
    • http://jkohut.pl/file/66401959450.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a8731efcaa379d5d7e6266251a0b01cb/babifobavor.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b507f37080---54699963075.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/396af5aba467f66ae0c097a1c9d41210/mavakaranulef.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021082920452965315.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/letegabuwewa.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/nakuvuxijekaranojujelobap.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/nifejebopawokelaf.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ae8b8b1d---penuvef.pdfIn PDF document text
    • https://redac.ch/upload/36347952899.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 10996 bytes
SHA-256: 3222b0afa1b24419ebc8639720e9640cf778390388aa04711f55f6b399ed22a7
font_01_sfnt_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1