Malicious PDF — malware analysis report

Static analysis result for SHA-256 392139e918218838…

MALICIOUS

PDF

77.5 KB Created: 2021-07-01 10:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efda8f2863de84bcc735bca40ff0c80e SHA-1: f22321ad0ec6d0ba8c1cf6b1507bd91a84707bf3 SHA-256: 392139e9182188384d634515a03de57323d8bb6b7af0df0da20c9af9bc9e5a7b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://medvor.ru/uplcv?utm_term=molecular+weight+of+calcium+citrate+malate
    • http://ahkjt.com/upfile/file/66670193470.pdf
    • http://ackerviewguesthouse.com/userfiles/file/23303073018.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fa395b7d40502691d652039ac7b99741/60573286297.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340f92be34---42447599356.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d58f154snecdbb2d6lcj4ugkr6/45739562753.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/pipukilifekam.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9805c1290---57099213550.pdf
    • http://ubest.ru/images/file/48542258046.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608174b6a25e9---lataje.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc48f86b3e---pikenakisejudip.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4c2a6cd3---99290256502.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/f4mt667ubkhbd4emp1do2hgurr/28508692225.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab881a5929---52880293578.pdf
    • http://olgapolyakova.com/files/files/57985059747.pdf
    • http://aps-mes.com/files/file/mebaw.pdf
    • http://zaun-produzent.de/userfiles/file/31501214182.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d3089355---sepuxedu.pdf
    • http://alexlunacoach.com/img/editor/file/93621025982.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1114fd8e---raxirikawiradibirapik.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ea17cddc---fubewokebov.pdf
    • http://mmdplus.com/userfiles/files/20210604_111636.pdf
    • https://arhometutor.com/userfiles/file/25309709681.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ed2ad42e0fa6f3e49b0548fc84ee6a4c/zekixuvuzudarubit.pdf
    • https://nepalonetours.com/userfiles/files/18214788493.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 16792 bytes
font_01_sfnt_off0000d9c3.bin
bc65d4356649bfc99ee1d1d0d0f4f2da183e5ca3959bd6602fb168058d5d8dc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 16720 bytes
font_02_sfnt_off0001055d.bin
add37348cd0c76228d26404c0a3a3539042ee1d895b4261e466f4d88689a354e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10688 bytes
font_03_sfnt_off00011dea.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 1692 bytes