Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b9e4ab8dd0442…

MALICIOUS

PDF

73.9 KB Created: 2021-06-30 08:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e949cfa1ee02c849315d6e8ad772578 SHA-1: b20ecea251d7bbe091b1602b56c92630a51ff04a SHA-256: 8d5b9e4ab8dd0442236c2976215a8ccebee701d7565f82b88415af95d83a0295
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/646d05723df7930b8922f39947aaac94/kadazilatilesajexafi.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ihob7vh2fa0acfre61rqmv70q3/25693714503.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/743062ae8d0ccc3c08f5734015c460fa/35001711186.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b3720d972e7616d43f9350dddde76d65/lufarelufupevuvalotipusex.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3768454f556c57e35a81e7d1c44e9e46/dojap.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfeb5c400b---31462480779.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e176c4f34---sosesexexek.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/21173527235.pdf
    • https://sunrise-photon.com/upfiles/editor/files/52789199655.pdf
    • http://alemotta.com/resources/original/file/35544509493.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/50100588104.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gtq3g65hnsnthtjb95bdgjfa54/22310053931.pdf
    • http://chi-kara.net/userfiles/file/vojarugivaxutuvuli.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec7c2f134---mamagu.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba994b1d6a6---19938052020.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/5876404454.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aa03466d0d88f62deacbf0b0f3c4a0a/josajinorixufez.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb7875191---wexezawu.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd5cd4f7ea---defitopegokewimugimege.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881eeeabd24---fuzokitidutojitow.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/th78dm50d54hiqm6vp5ck5l7aj/12256375680.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/87138472710.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4009176392b62caf93285e1f9e8e9535/23301248261.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mi7h6if7d1uhgk5upd9k29tm7q/tuzimaduditovugedilot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=god+of+war+lore+and+legends+pdf+free
    • 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_off0000bfe2.bin
c715c7b76c0a7c11181daafe199ddcbd61438b64de278526b28dd8d109993f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 10608 bytes
font_01_sfnt_off0000d823.bin
2861e18c8885e09c6099312d257e5683b2517856906be9d67f7d8131f5cfc0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16316 bytes
font_02_sfnt_off000100b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes