Malicious PDF — malware analysis report

Static analysis result for SHA-256 476de2be4db9ce0d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 04:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8811e53fc83424ecdc19c224f38672a1 SHA-1: 70ac32f18c7f8e1cb3889dee6fec76e05801a016 SHA-256: 476de2be4db9ce0d88cce2f6d34b38d26f3ea093f067a85bd0126464bef034ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=which+country+has+the+highest+population+density PDF link annotation
    • http://axi-hohenstein.de/userfiles/file/lamosojolevifupaj.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/pixodaboduwokumenarawur.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/bunoloroxogokopujox.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/51200256812.pdfIn PDF document text
    • http://etkenkalip.com/files/82324996989.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/gajutavitezigoto.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/9693919244.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/duzuvotamumazakemunofap.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/xivofugo.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/bolajopekoda.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/morovemirurilomulogetesa.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/17919096763.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ecf20tt0pq53lbgojek0cln945/17273808943.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/riziroxaxuxuwidesemudatiz.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/pigatuwux.pdfIn PDF document text
    • https://tl-systems.hu/files/files/rasawejowifepu.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/8002878012.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131c51f12a2a---rutasabamosulinukiz.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/23a40cd7167a9ef4ab74c088ee541e1d/nugosudelazivegiwotudozo.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/51587280956.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/38240354188.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/lumofizomar.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/31231045016.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_off0000c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FF 11000 bytes
SHA-256: 42f4d178ed9c60fb668425b8aacb70eb652a07618020bf0a29e965496434ab12
font_01_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 16984 bytes
SHA-256: 073a560b08c3be59a72d880364a240e487de6d455811f39dcc4192e73fb943e9