Malicious PDF — malware analysis report

Static analysis result for SHA-256 44420dc0cf6666ee…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 01:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 017bb88e20af53fdb64335a620d26add SHA-1: f36457779672ece3a536a80a9ff522efd89e80cc SHA-256: 44420dc0cf6666ee482aab7bfdfa935035576f42b61a250bca80634ef0a03e46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure malicious destinations. Heuristics indicate these links are hosted on disposable domains and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+do+i+uninstall+an+android+app PDF link annotation
    • http://neoneofytou.com/ckfinder/userfiles/files/vosevoluwinogukamufege.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/06/39016804426.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e42f3dbd0e---boxulukifesorawoket.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/88855392543.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/wijorase.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/sizolinefa.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/wumekina.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/50666894597.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/xadobovazivarijumuvipo.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/130048292030.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/vegureselujamur.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b813k9mgls9qrnkt558njc4dd4/51230622233.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf08d17233---25365233249.pdfIn PDF document text
    • http://kahasat.cz/data/file/vawepire.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/39350104436.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/divikejuzemiwubonini.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614716a86b5d1---75235008800.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/najiluluzaxe.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/89547424431.pdfIn PDF document text
    • http://nktrading.qa/file/files/28732074838.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0003f3771---82147445371.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/pinuxakobajid.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/vesajamesod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 17128 bytes
SHA-256: b38388000b55337f31e96f71cfa3d27cee613c065d79a3f88480a84826afcbf9
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 10428 bytes
SHA-256: a94c6def2248e1e975912a897ca6e32cdd5837d176bac48893bc143adf72f624
font_02_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1