Malicious PDF — malware analysis report

Static analysis result for SHA-256 7754edacbf43dd32…

MALICIOUS

PDF

71.7 KB Created: 2021-05-17 14:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 001b8c2496fbaebb9e775782125d9f85 SHA-1: 3d92d190fc5a2370cddf066c19f56f4bcc6caeee SHA-256: 7754edacbf43dd32da502cde804359edaebfefc544f49dc86c4c15823bdfda68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a Cisco datasheet, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd40929a---49997589118.pdf
    • https://betalinktech.com/blmedia/file/73870058754.pdf
    • http://ebslang.net/_UploadFile/Images/file/jarepe.pdf
    • http://hzjksj.com/images/upload/File/wukizenifowodaxaromib.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a05406c2795---73741247657.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d6a9cf2c89b32355e6cdbd7688579857/nekarilujafasa.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/612e0f3e91bccefe1624a2553682d28c/69008616150.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b76f6e2a2690783067948efbf19ab705/ganazojagenekewozikomubu.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5ddb9141---kupixikebufitogibin.pdf
    • https://anukulagrotech.com/userfiles/file/genetolewo.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8effeef41253e191f3d9032b2b71fdb6/61871251961.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/9a5mtopnaqrtsjqpif1s0sulo2/xobegimevixug.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f01f33ca2---42114106651.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f9932c49---65575021883.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d571908fe9---kazanuno.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822726c7208---xutel.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc339330f4---nawetunogenaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cisco+ise+sns-+3515-+k9+datasheet
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7c.bin
492afdaf1f5762dee8f38b47b827110a465c843fca4ce455c67dadbe9f455bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 5396 bytes
font_01_sfnt_off0000ece3.bin
587c584915bf5bd74f15f64f59f2f28d630a7d8b790604b3c990ecb4e6756779
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10900 bytes