Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd8dc57c3ec9851…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 23:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67c987ae58e67e6f791d40f8bcee6b90 SHA-1: a6b9e37ebf460a903227fa72d1fcba6e32ce04bf SHA-256: ffd8dc57c3ec98515fddf8f6e0d2d4c6caa16206c39f38c73c285a345404c518
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest 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 URL analysis and heuristic findings.

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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e546d681---bafaleluna.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6ca8bdc2---pameta.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9dee76492a937589f6c9dd3fc3f8a13f/12481998497.pdf
    • http://micronforgacsolo.hu/UserFiles/file/bonetix.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/080ae4fa7866f0c4746e82ee6057d566/fokixamobu.pdf
    • http://aylincinarli.com/fckfiles/file/13504879916.pdf
    • http://archi1919.com/smlclub-files/file/minafepuparativud.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/66ab35d52ac30fde116ba2b1b3769b1d/1048433233.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/g5jmi5rmi42p5p33m4i54j7v4v/23335559868.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd60536a9---98345194334.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/unrdu44oc15idgm62h8km4oq43/31654307004.pdf
    • http://anhopphat.com/uploads/files/vuxira.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7370c0415f---xefomopusujadasonoxilogit.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c15035de208---58342032698.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbb04f3b520fcdb1dda564363af8d33e/wujuwodenevodagavakepe.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/bagadugaraxitabesokejeto.pdf
    • http://stinpo.com/ckfinder/userfiles/files/7928335861.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf6dd62f05---pudotudovatamojorifan.pdf
    • http://enotecagaribaldi.it/userfiles/files/futuvatusenuzutasopakito.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/80e62c9a7536f9d3b5fa028b9200a600/12891594084.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759be09ef79---77765150388.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac897f3ce05---puzuxadariga.pdf
    • http://showpalmedical.com/userfiles/58909243391.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=a+walk+to+remember+year
    • 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_off000107d6.bin
6764ed7115498343fdd3f2316dd403d1136c73c158544f90eb62f881d00dfcee
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 17496 bytes
font_01_sfnt_off000135d7.bin
496f447b0cd1f2fbe9de39d613442a5cbba76254b3e4c5ce8b6db15c5c5d4953
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 10320 bytes
font_02_sfnt_off00014d44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D44 16792 bytes