Malicious PDF — malware analysis report

Static analysis result for SHA-256 c467b5f7bea586d2…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 14:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: debf5fa49e8112f820fc8520be95e2d9 SHA-1: f34915518e6eb38253241134741d9b44c94dc03d SHA-256: c467b5f7bea586d205d34c689501d030c15c5d283e2d3128d7b3d64417fb03d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting further PDF files. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28798e1be9---24882014905.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a6ej0jtr1ec5o68cj37ofaugld/zugega.pdf
    • http://jucal.es/images/file/ritot.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609471d164610---gufumisoxepewapizebo.pdf
    • http://rkmaster.ru/uploads/files/88324218778.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/39f8d4036ffaa9e41e5838a49240c8b3/nebowekuzu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pram116t5f4n581mimv10kuf1l/97259733996.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb15a02c64---93520643529.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78cb845d66---35925972457.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160850d68d44c6---5268639885.pdf
    • https://noihoithanhtuan.com/media/ftp/file/kevigaf.pdf
    • http://mebco.ru/images/file/18169645244.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c4ce65c54d63dcae8054afb5cc2e3813/kusopajegibanozomosim.pdf
    • http://nfrostov.ru/upload/files/gidajivegapo.pdf
    • http://ventilatoryzlin.cz/images/file/wosomina.pdf
    • http://uptownchantilly.com/uploads/files/dotavovisov.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6195b042d---wowetewem.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/27610594318.pdf
    • http://amuseonline.com/absite/userfiles/file/koririp.pdf
    • http://sakuragiramenandsushi.com/uploads/files/faposa.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064a75d5ff---kelugovukevusosidu.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7fccb5f78---63551304572.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+paid+game+for+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_off0000f466.bin
e265e3ee37d1e26ce5eb91ab4bcb0d531b4833c5cf682b232c07ae156c07457f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10744 bytes
font_01_sfnt_off00010cdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 16792 bytes
font_02_sfnt_off000124ef.bin
79bff76c80367487ce779882a4dc30092473a3d34d5f88b1e56cad7cc113af3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 16920 bytes