Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d585cb71ff1246f…

MALICIOUS

PDF

89.9 KB Created: 2021-07-13 19:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6977f5dc1c8aa8545d592636f65f347a SHA-1: e1653e18e1633db473a180bd2a980d595353bf50 SHA-256: 5d585cb71ff1246f69694c6aea957d9c770a67b8e51f1358cf7e421b54d539ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised websites, suggesting a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates the document may be attempting to impersonate an invoice or payment request to trick the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crysiq.ru/uplcv?utm_term=accruals+recognize+revenue+and+costs+as+they+are+paid PDF link annotation
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/7b61044e22cfbcfd4e5566fc2a5127f6/48113671836.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0c9e6eb4aba3e7e09b52d0ed2370c1d3/xifodugereko.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afe426a3d95---65549097057.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/takuvuninuwegasu.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/45816603467.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/zozugorom.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/dogevigobak.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ad6d2659---17532365422.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/48913137786.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aa8c57e9c---wetabemuvagokibomev.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rl3f0qildo0e17dide0pc7dd22/sixiborafoku.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107122308441056.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626121596.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1c2bf99a---nujedosexarunitamoboz.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf5d5489f---lololufonefodojekawovo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f3c808fab1dded6f133050438834de9c/72795793375.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/936bcd75d82ca8df19e40d435f187d27/bezoburubugufape.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3d78d4245---77911879215.pdfIn PDF document text
    • http://alkanboya.com/files/file///sijenivazefesoxugifalur.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zekigosutowid.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/87018307834.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/romovasupelirozapedepo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e18a03efd---84456042233.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/lixuranurawikebug.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/renowibenirido.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/53667683996.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_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 17368 bytes
SHA-256: 5bb5bb94e11626c20b5f9f832175c94b83df4e49066c4a9677665867c03fdade
font_01_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 11112 bytes
SHA-256: 27f4265031ed33e3b599bf0865517339e415e4ffb8912ab02de5513660db3473
font_02_sfnt_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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