Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f49b34b62b241b…

MALICIOUS

PDF

95.0 KB Created: 2021-09-19 04:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcc64190e04ae2c637350293b2586942 SHA-1: f6d92b36ab38d820ecef93dee6689646ffe26cbd SHA-256: f0f49b34b62b241ba55a2d65e5a4f43cf02475a719aa948b018f732e0b8dee08
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=android+google+analytics+api
    • http://getem.pl/files/file/ribemowogiri.pdf
    • http://aaronandanthony.com/userfiles/files/29563912395.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210919_D141B1F6BDCCCD5B.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3d537e8d1477fae98908918bd1834ce5/zisaxavez.pdf
    • https://vmwarts.com/ecovic/file/totifotavusanagagiwudakuf.pdf
    • http://architettotoma.it/userfiles/files/46591356941.pdf
    • https://laatuwhuisweerstralen.nl/upload/file/fefojupojofikobozekasonu.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/29333957471.pdf
    • http://toszegisuli.hu/userfiles/file/kepedag.pdf
    • http://njxinbell.com/upload/files/94429893347.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/67576543856.pdf
    • http://dinhvi5s.com/images/newtech/files/wazesewadana.pdf
    • http://campbellelectronics.com/uploads/13470049893.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/66274064601.pdf
    • http://nelly-design.ru/upload/files/gufuvarumelenonixiwu.pdf
    • http://ocean-ex.com/images/blog/file/32385877134.pdf
    • http://exoticland.bg/upload/files/files/35294949449.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/lipunijevoj.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210919/0751065697.pdf
    • http://abwingsbuffalo.com/uploads/files/xekeduxorutegovosafo.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161349685dd671---20691169304.pdf
    • http://lyshiying.com/d/files/bumesu.pdf
    • https://vendax.ro/files/file/92766808358.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d173d764---13231930468.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_off00010ac4.bin
46f8d56e734009559b26e8fcbed4d08979db980a098b7875c23b9f071647ad31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 10784 bytes
font_01_sfnt_off0001238d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 16792 bytes
font_02_sfnt_off00013b9f.bin
778288fc179a9d34a716a612ad52136b1eba754795b7c4eeb82cb3606cafc7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9F 19260 bytes

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