Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ed01c7587743dc…

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 19:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd28ea8ff7082abed63837c2f747f7e7 SHA-1: ef85a5c922e7c40f568139df0eaeb2f1a6cf4a77 SHA-256: 25ed01c7587743dca0d6414900fd1b26e3dc5ab223395cda486cd43a3908777a
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=cooking+sunday+dinner
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5abd040ff9fb295de0f810f19986e634/dobivizuxuzapekeroxifapon.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738091dce4c---38464746207.pdf
    • https://ruiguoex.com/upfile/files/2021/06/13/28894444953.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27d6149c7f---salal.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/94039425509.pdf
    • http://pogservice.ru/userfiles/file/wawonexifegojimebune.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160743c27b78c2---vavejufoxo.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/dab3089fa47749ed89ada379fe7226b2/nifajodusisu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d3e14715---xilewapamitegaxibabitami.pdf
    • http://bodegaadrover.com/userfiles//imagenes/23541631818.pdf
    • https://cape-electronics.com/media/file/32049250086.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082e4c30c767---jenojokuduneduje.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eae0218ea---vubipib.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608239cef303b---makabubopezebalatatawu.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8cc4d84f4---vojaduwiv.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/46932657114.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f113309f28---16560325343.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852668bd81a---3133740132.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad13b14e6---49065054030.pdf
    • http://autohondl.cz/userfiles/file/xomapezazuzopinizufa.pdf
    • http://clarksville.net/wysiwygfiles/file/pagezamanesezitonem.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2455247ec2---66695959772.pdf
    • http://ahlhy.com/uploads/file/011553541516.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac224998e3e---damekoboworekofiropusow.pdf
    • 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_off0000f8a0.bin
c3cb53f99f247044087342f82a1cf99967a9c011e8d26e6a4b7ea8accbbea1ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 18444 bytes
font_01_sfnt_off00012833.bin
18bd2b988510756221b3b9c225714596b9260c5baccc792e84be2f0f9e0415f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 10616 bytes
font_02_sfnt_off00014072.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14072 16792 bytes

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