Malicious PDF — malware analysis report

Static analysis result for SHA-256 a341eebea58bfd28…

MALICIOUS

PDF

72.4 KB Created: 2021-06-25 16:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b194b5d5ce957ccc5c107e5267f79f0d SHA-1: 6cd298869e7226c44ac70368a40dd8fa6274d04b SHA-256: a341eebea58bfd28a1ae5df06218bd94c9b0883332819b44a15941efac9b28d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://orsolyajuhasz.com/ckfinder/userfiles/files/wuzojagizofu.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7929b5f1---nusivedapekasunenowerove.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a1bf2316b5d5e6fae416434534d33a99/dovugisuka.pdf
    • https://ecole-anglais.com/upload/files/60498210604.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a848ed9d---39612333491.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a801931355---53143981150.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f02612bc366a981239c2c41559e52a0c/22996797709.pdf
    • http://diclenakliyat.com/userfiles/file/71660329334.pdf
    • http://woori-tour.kr/FileData/ckfinder/files/20210612_4BEF22D6BA30657E.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7069f4e6---molisosujisenomiwubagefu.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94645a1112---91635159842.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f4b7e85b---jumefutudexojolebu.pdf
    • http://stalmost.pl/userfiles/file/35752305107.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tulsian+accountancy+class+11+solutions
    • 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_off0000b815.bin
48bbab1602850800418da8f86e5b46d6855e600b12851cda2724f55a59ae63f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 10220 bytes
font_01_sfnt_off0000cf3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 16792 bytes
font_02_sfnt_off0000e74e.bin
72a63e5511baf5f5577f1311e7b04b04207ca658e2e1218e7812a956ab770fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 16892 bytes

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