Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f61cacd79e64551…

MALICIOUS

PDF

79.6 KB Created: 2021-06-29 21:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f743f89a737df02f91ec495d8b39e4a SHA-1: a764179d9aa4d0d9f48829f9543e1786e317d980 SHA-256: 8f61cacd79e645511935e4c566ef9895d1bac8489f1a77c64c91257bb18e3f38
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting reinforce the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/864bb10a8bed4a93cdbb72f0776fdc0e/budej.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6df880f12efa940d10686258fe4999d5/sorega.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/273e0036cb2bfea01ca4a9fde0a749df/62661215932.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/030fe243ca1437ca450f3b6b87fde354/mosanatezuv.pdf
    • https://amd-export.com/site/upload/file/nokuga.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8da2bv76emegkerng3m4gv64ov/keminuzigabi.pdf
    • http://technocom.pl/editor/file/musibazomafepewodexiwem.pdf
    • https://uniqrelation.com/userfiles/file/zugarasilutusisumetumawit.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4f47963a3e4fce0bc80339ca4ac0e837/tasuwegugititewabixo.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3bb0fc3efb73d0862ca5ca22c555c3ae/zolamibemuwos.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c29d9796102f90891ee7fe27f89696f/jotaviwetexivotorikateniw.pdf
    • http://auxerretv.com/content/public/file/siwifigiromopimisi.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe488e1bf4---dokegevumoda.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a2dfc45b7d0fbe7a54eb27c15842ba26/22266872508.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bpmukh4uspnk6mfhto1k9td055/wuvedazepivafinigipojiz.pdf
    • http://auxerretv.com/content/public/file/71826720060.pdf
    • http://matsonconstruction.net/userfiles/file/57183865392.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/44312235929.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac036a06e42---35890229094.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe673ed962---zugipikajuroripuzib.pdf
    • https://xo-sound.ru/userfiles/file/77540160938.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3e365a3f0a8dc73be7ca7fd1bfeb12e0/71816662972.pdf
    • http://kingtonkatsu.com/uploads/files/befowixotubosugixim.pdf
    • http://clubselectionvoyages.com/images/file/marifakedegexenug.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d189981f---lofepenosinogimifogex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=respiration+experiment+with+germinating+seeds
    • 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_off0000cfc8.bin
3bf87ccf27bb885668ed9c0c699bc02f8adca1bf4a9ae6fa858fca5b1df80d12
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 11028 bytes
font_01_sfnt_off0000e91c.bin
53e5301e0913efed8ee7141c82883fdeb8ea63fef2104beb139557887bc1a985
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 17588 bytes
font_02_sfnt_off000116d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes