Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5a07bb11f6bf15…

MALICIOUS

PDF

84.8 KB Created: 2021-07-26 15:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 777ff2168cc63bf9fc035420e663886f SHA-1: b7ad6738489f79a3008457ebf8cec3e1dd85ad8c SHA-256: 6b5a07bb11f6bf1572cb39a262c1992f72f73fab976abfb1d4d16266a1db562d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable domains, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://budohurtsa.pl/userfiles/file/topozoxedemerunurigas.pdf
    • http://pampa.be/uploads/userfiles/files/pokupirodalirenidol.pdf
    • http://sushiosushi.com/uploads/files/fotonutazesig.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a340fb8771b4f0c1b566850236b9fd3d/vozogem.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f0f622a55c5cd6275220ff9860b5e8eb/20066177478.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7b52dfc8a2006985d1e70bb0d9d83aed/32576253006.pdf
    • https://napraforgohotel.hu/upload/file/39161524692.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b9ecafc1---jilopolopumazuwenotosi.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6649da9eeb09fe16c0c73021556e63e2/53645406841.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/316a3d0e76336b8e1218b969efc0c183/voxobapajuvasela.pdf
    • http://omni-links.com/images/blog//file/82841459768.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gt7kqmttp5saofdq721326vmn3/17615787952.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/85504172336.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/534fb19dc20e7b9fdd531077ecc5df88/94723701188.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3cd5bb561018cb060a20f2668be36194/90735675273.pdf
    • http://massageindex.nl/images/uploads/64676170484.pdf
    • http://halongbaycruises.org/upload/files/80791554935.pdf
    • http://architettorobertafasola.eu/userfiles/files/wajobiwusafakupogedomet.pdf
    • http://nsfeed.com/_UploadFile/Images/file/vuzidiroputupadexezisav.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc32f87857---kuretapikawekule.pdf
    • http://yildizteknikelektrik.net/resimler/files/pinubolagelozadajeneseka.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd3a24739---9571054431.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/3c4ce9ae90e7cedbe98c3e2d81ac77ce/lomudiwupa.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a62431270---90352380758.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c27390355bf---gujirepabifobafirizifi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what%27s+the+square+root+of+45+in+radical+form
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e782.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16792 bytes
font_01_sfnt_off0000ff99.bin
eebbc52665cd32f3527018bc7747df24c22b996a7776b56da2860f69738a06c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 11228 bytes
font_02_sfnt_off000119a4.bin
e132ee522c64d70bfa50efb9fca40826a37cef9d1c8630109c11a8b6741ec021
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 16668 bytes