Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb16b85fb86529e…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 16:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 067d79873512db5432af7a016c5e2fb5 SHA-1: bb91f3d70367a569f324377b54de3a893d135640 SHA-256: 6cb16b85fb86529e38d6ede42ded048f1df5a1b9886f75cdc14cc536e2e787fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs hosted on compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7be99d00a---perivusevevexezalu.pdf
    • http://absolutelyneon.com/userfiles/file/74700629020.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/33cad4c6ca500d031c546d71adf97c66/xozisibepami.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e976c8dee6---wubemuxufukuzofimesuji.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a675dbf333---nabopujoturibenobovos.pdf
    • https://cambodiadriverservice.com/userfiles/file/vamozigodizusuzapojapatu.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bb2e5226---tijogezuzab.pdf
    • http://appletechsolutions.com/userfiles/file/gileno.pdf
    • https://bititechnika.com/uploads/file/32233513188.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cg3hllvteiiptdqdmcur0h4q59/dugur.pdf
    • http://slp70.com/clients/873855/File/kezutebebizezinasa.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1rb08dmjfbdedl09hmuol6lla5/tefizabazosivikuwamijeb.pdf
    • http://playbabydoll.com/userfiles/file/19821512134.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/jibesuzazurasetoxonalaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=touch+vpn+apk+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8e.bin
ab4a82d7df3c4a14f0f03bf616a343564ba8db72ef3b5d84bddb094fa4f07bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 10668 bytes
font_01_sfnt_off0000e800.bin
d18549a7693e6e5643e7967f8d95f5b59cf8b8daf4943325343c5aca4602dcd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 16200 bytes
font_02_sfnt_off0000fdd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 16792 bytes
font_03_sfnt_off000115e5.bin
2e9764ffa99b8f0088db08a688cacda8cf046d3eebdaf5154f31c297b1a98adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 17276 bytes

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