Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d4f5f8fc4a302…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 18:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31d85e43f25a098ad71c26e7d1349b65 SHA-1: a4b4ca8f113680437b6c1c038893799688344812 SHA-256: b79d4f5f8fc4a3028dc0b47cc6a78fadd17a56fc4eefc659eb267c2288b34657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • 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://kolkandkolkdesign.com/site/data/ws/files/90264583600.pdf In PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/88639900935.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/zaromibapubigezoj.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/lulaboduxutalobutipejubim.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/ximiwesewed.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/zoxurokowawesivu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/acdc78fe6a2e16e10d4b386d87fb464f/7015882924.pdfIn PDF document text
    • http://climtech.com/files/files/rosuto.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zabobuvad.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14fe77161---letagifefe.pdfIn PDF document text
    • https://novitas.ro/files/dafunupadopasipisate.pdfIn PDF document text
    • https://rafautama.com/uploads/file/43170122229.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/21295772716.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/febuwefegoza.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pomofonigekuwe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134979521ff2---14412384877.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/wenevaxisevunamaz.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/36576352935.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9349f68d---fewisalojolixas.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/vasojeforopu.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/38764833442.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/warebudajetajukasewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=merge+dragons+hack+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10588 bytes
SHA-256: df49fe4cd8f44b28e749cd443577eaebc85e91b139033445a4679fd3d2af3bef
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 19216 bytes
SHA-256: 2b9fb28c85901499c01c34c102404345a031e308a604baac334fb65090fae5e5