Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e93594730060bc4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 00:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad12ae1ab7a9c5f6a34c17045f25b1e6 SHA-1: 28b23f3de209bc686538d37379031b0364ec42d9 SHA-256: 3e93594730060bc4d20013f22fb8161da36b3a580fde69e49c30ccc2e0303f6a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary URL, https://drafthe.ru/uplcv, suggests a lure for downloading applications, potentially leading to malware or phishing.

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 https://drafthe.ru/uplcv?utm_term=vidmate+app+old+version+2014 PDF link annotation
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/66937329280.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/kenot.pdfIn PDF document text
    • https://kratky.eu/files/file/nirob.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/9522332003.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/92651185780.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/83216161070.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/52617409219.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5i9o6s7gds368qatu9hvnhr935/duwogododukaz.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/kapavuwe.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/pomiforiwimorikodabo.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8efa0388d79fe5b168aecb897d27cda9/ruzabobarelaxe.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/95813946831.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c90a83a0---34860573037.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/jogixefupebolapivuzom.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109050050521909.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/jurufuketewinobesog.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/rabuwunamapimiziwifo.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109110001006111.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/86588508561.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wekoweb.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148ff6e82b08---54955849467.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210921051255_bgl3a8.pdfIn PDF document text
    • 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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 17856 bytes
SHA-256: c73315e1dbb9173a198a43a6b20a7a8af758b54325be9a16fc7b77c75daf15dc
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 10960 bytes
SHA-256: a8ce900110a9d75e0e08cf636af875eac04df47b5dab662d37e31a56caf31322