Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf88b7da3fd6c93…

MALICIOUS

PDF

83.7 KB Created: 2021-07-16 16:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2abbd93acf03f5a0fabfcdca876fbc9e SHA-1: 92ae2d30d4abf7c4c58049cd495a7ef4581018d6 SHA-256: 7cf88b7da3fd6c93b2cf511b5dfe460fd7a020be5e3556c3a41507a98ea3b336
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious or phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://edwardlankin.com/clients/86087/File/10376000737.pdf
    • https://iqmuseum.mn/uploads/files/40366635022.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9017463419---34390285526.pdf
    • http://al-bandak.com/userfiles/file/49755515526.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6ldmbranh26s2udcvuee609525/83019051613.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/97a715ce676a37bb1deb9b6c3103e305/zibizevikexuzo.pdf
    • http://foto-klub.dk/userfiles/file/muvevovijumokupi.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/70458102937.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb0d63826---56306269879.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8623fa3f---28904176956.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/63f3008734ef6048ce58d368e5a05baa/putorikizegivini.pdf
    • http://mdsalon.ru/img/lib/file/69441709419.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d801885821548ff9cbda1b56a4d9965b/50529524281.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80a128469---19728645725.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/telerugima.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fab273fafe5d2c8f85ee0faaf02d7cf4/71271236635.pdf
    • https://torbay.ru/images/uploads/file/31866691749.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/bigomaz.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/01926e595ccd113053ed36680b7f41ae/97417287434.pdf
    • https://go2germany.ru/files/file/34014909052.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/be892ef8cd33a06375704619cd91f172/fabex.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a295350051e---360480359.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+spam+action
    • 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_off0000e66a.bin
72dbddfe5efacb9afe878ea433c7e46c57a23b87d54c07a120c6bad7998541cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 16824 bytes
font_01_sfnt_off0001125c.bin
37ab31ffb9c383c6f6d0dfaa0794a5f99ac4e59d2be001806c51c293121d3e45
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 10396 bytes
font_02_sfnt_off000129e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 16792 bytes