Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a88339c43803d7…

MALICIOUS

PDF

87.2 KB Created: 2021-07-28 01:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a330f2b138aba1aec4d7fd6c3a6c633 SHA-1: 9187af3566beaaf5351f092b1717b21081270104 SHA-256: 84a88339c43803d7e523f8fd14c2d5848b71ce1d0bb781df6aa6fac7bc7e630a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e924d1c15d9fb7272f673510e41ce631/88231244287.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8166983d---38214670416.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9f246136---94344785015.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/kizavigagipobis.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608177ef0bab9---vanijaxerebudina.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210716_89B5542C0EC3B495.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8880snlras47kmevsaqj1nkdg1/lodaw.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/171249503560a6b33d56d05.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71c9cfc62---6710953222.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/gewoxuwilebabevulaso.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/turexebitopole.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a09ff100005d5a0b7a84a15c4504a4fe/88432158228.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/68512780514.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/31405618688.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/bodajunavileluninuk.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/rejivuguzokinoj.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/51520277276.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a91b4f21b---muniso.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccde414e4---tokadatipan.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fce41cd00a6---1184532033.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bepoga.pdfIn PDF document text
    • https://la-klamm.org/Files/files/kagodesesubug.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d63fe10158afd1f607469f5e4c7eaafc/vumaxevezuvewowuvapif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+omron+7+series+wrist+blood+pressure+monitorPDF 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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 10760 bytes
SHA-256: de076a013ba054267c33c9ed06056bbc5687a1eded80a413ef3f36b1daaaaa45
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16952 bytes
SHA-256: 50e40edfce0eeb6e64deaaf7a01f3842be89146080d359dccae25fe2ba017ee7
font_02_sfnt_off000136fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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