Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e57f342089bf0d…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 08:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37611f9c901d2379cd74dbf35863acdb SHA-1: 27377f3ea9107f7893356e2112d83fe3c7c7cd2a SHA-256: 80e57f342089bf0ddeffe951900edd94b6430cb83743d2c353be098ec960b142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c9f32f963d19f6bda607872f012fc8dd/47030540537.pdf
    • http://caratow.nl/userfiles/file/38878491448.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607048cb8413c---63400185881.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/zelimafiduraxopo.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/wubodasinidebuganonenizut.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rbhhi0mnbbt9pj9alepirh2s00/45194542582.pdf
    • http://zonazero.es/userfiles/file/gemurifunovawilinegakeda.pdf
    • https://satybharat.com/ci/userfiles/files/sububutexina.pdf
    • http://chiesamadremarsala.eu/userfiles/files/56297716524.pdf
    • https://tidaksusah.com/contents//files/77211042838.pdf
    • https://fallsplat.se/file/velibatomen.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/daxawojerasog.pdf
    • http://busangh.com/attfile/fckimg/file///20210607124918_741380568.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/54a574cdafc619234825d2759cf36c37/57039633251.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3c0c0997989f598073fbb8df4eea06f3/jixaw.pdf
    • http://ashioke.com/images/library/File/54431876691.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1291dc6a5fa376ad80d4c06c82ade28e/mizibojel.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f0d37334---xefisa.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jd3uo356os9a9ocku9dmiu7jso/77608676394.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7f586a4b3f---fudelufi.pdf
    • http://kantoromega.pl/userfiles/file/7394142754.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/rekunimijigiwitijudikiw.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda75a89ae---boviginoludafeton.pdf
    • https://aspirans.com/files/file/22842344156.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4505843d31---ritoveva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=employer+did+not+withhold+local+taxes
    • 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_off0000f2a6.bin
1e963cb501a8c2629ec7e7a0561c34efcaf27a6907c28565653a5c2f6d84e8ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 17288 bytes
font_01_sfnt_off00011ff5.bin
beadd74d40c4e6e541c2bcfbc2aa5c39646339b3e615dd6210249c7f1a04358d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 11064 bytes
font_02_sfnt_off00013993.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 16792 bytes