Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac24f78cab716a8c…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 19:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aec593acb6b07d0113418e80a83617c SHA-1: b6b895b63cb1797d6e25423f9453356e49aafd00 SHA-256: ac24f78cab716a8c1a941491962ac366edf3d481979a65a0e9c5a9e7f3cbfce7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains identified as disposable or compromised, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

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 http://innotec-industrie.be/userfiles/file/29178606372.pdf
    • https://isosklo.cz/uploads/21153926660.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6cac79bd806d2b7c3f63873009c4374d/78949500447.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d330cc5c04---xogerujefimufesodafezuzi.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n9d74r6aj5uvrvihv74kd2t3i6/16312439873.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608898ae84d68---2485647278.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/b0c8b9bd2324d905369fbfa0fefc7f69/rirejamomuniwo.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/op6v6fh33rivph1gafk9bqvc40/gudaluvuwumuwapajiwitotus.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf465c4d15---83200927941.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a3d72b8de0c878dd0f1dd6408c630f4b/wotixipe.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/numon.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fb9d66b0---30850461910.pdf
    • http://sanphamhanquocymy.com/uploads/files/44053647103.pdf
    • http://efuegypt.org/userfiles/file/bigowona.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/549c4b6c995216cb11d9df3a442feb65/vimexorawalasipav.pdf
    • http://degrossier.nl/uploads/file/66777146444.pdf
    • http://aiaciran.org/cache/fck_files/file/11667432595.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/dcd80b8d843f6ca08a3f0c3775334344/69150590538.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ca89fe77---gigaxejikoxonaxudo.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f636cfcdc---mazaguzagurodegifofis.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8f4f54a995e30c6ed4331079b1cc02d/99931298979.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f18e80e6798f9f183668cbb59ad4269a/remuvurumeralunurolawed.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/15661116105.pdf
    • http://meta-min.com/files/30878918376.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3f220e0c---6883720417.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=normative+approach+of+political+theory
    • 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_off0000f256.bin
dbe98dd7f7c6fba363a69cdb342d1d8611d0705b5d3f1e90b196776a94e886a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 17452 bytes
font_01_sfnt_off00011fd2.bin
2878ed55417f6db112b34342de29dca2201fff4b42f9a1f6879b97e059c4c43a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 10628 bytes
font_02_sfnt_off0001382e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382E 16792 bytes