Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f5aec6595fc618…

MALICIOUS

PDF

100.7 KB Created: 2021-08-19 16:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28dff0f400bfd81a5ffce25b4ab92e0b SHA-1: 426bcce7e0565733fc307be4827a070b2a6f887f SHA-256: 67f5aec6595fc618a63e0f065b5a8fbb6ff24a5a1099159b36a4d119c6d6d65a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the nature of the URLs point towards a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://medvor.ru/uplcv?utm_term=mbq+housing+application PDF link annotation
    • http://dush-kz.ru/uploads/fck/file/68473779925.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607963fe42e2a---76459046885.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7al9lg35lcgb9puv8ut1jk7rc6/95808935808.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dn5irgk3q1b75kjicqcopdbh4p/lomemamorajidufu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842676503c---zarimizemukurotuzorojizel.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/shopm1s4vavh2o0rf2psmhpqep/48275639219.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/koxafitavelojewexap.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16082f65204990---jorifavuderawezug.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d3a26b5603ac0e59bc5df8b491202b36/51517675866.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/89583357542.pdfIn PDF document text
    • https://arerp.kr/data/file///bugajijegezosumawozuro.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/tijudibikajigusijopazil.pdfIn PDF document text
    • http://cloverdiamond.com/file/mopubavubukaf.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4d42389b3869e4126e94abf9241b349a/69428683495.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/734160ed32d83041452cdcc7f700a3bc/digibufudedexezanenajoji.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/sipazolo.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/bewopamanosa.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609853758e110---puvukikepipetazexuwokexa.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/jekukovonuvum.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/zodarufedimota.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/tesorafujonu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/74ec0e9bcca81370526e9be23208fb0a/pitaxabuvuxokamujixup.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c463d2d2988---mosuw.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/40738898416.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/mobafivovizozoto.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a8521b077441ca527076e9e741db339f/56290128662.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_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 18816 bytes
SHA-256: 32196ec4a72dbf42aae2fbda602e14dc7f1a183d7b6b8b9b4f6a7d8fbaabb7fe
font_02_sfnt_off00016caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAA 10800 bytes
SHA-256: 2cbe62ee307ff2bf25dd935efceec7e44dd05dc6e9573f51bc8d3bc1ea46e58e

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