Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc224722ef5bfeb…

MALICIOUS

PDF

69.6 KB Created: 2021-10-12 09:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 25ae93e8ebc86e503431f3ade0a39a13 SHA-1: b7e7f89041331788f3f22c8517bfc3cac9a2772a SHA-256: 6dc224722ef5bfeb97dec756406463dbf297d8437f7e21534ebc8467534311f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://vroa.pl/chplusfiles/file/75585053085.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library/File/32379104022.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/1377933527.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/64056402829.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/62135668924.pdfIn PDF document text
    • http://capri.lt/userfiles/files/siwiworozarazaxogofefabe.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/lozewape.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/99336478e32436c1d30ea9df158ea0c9/72063992141.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/faverupufimokageziderudes.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614789050cb86---18617446134.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/70702628767.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/nusimigudawaj.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/89222552903.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/foxekipefubawonunu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b601c4715fbe5ca9b147aba03fc6362f/10225177452.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f1c51394---14868647096.pdfIn PDF document text
    • https://yilmazlift.com/userfiles/file/bulom.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/90487817700.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/56825202623.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/24704032379.pdfIn PDF document text
    • https://www.poeles-granules-vasconha.fr/ckfinder/userfiles/files/mazibutoxedepab.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/gerosap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=how+to+turn+into+any+mob+in+minecraft+using+command+blocksPDF link annotation
    • 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_off0000b03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03F 11344 bytes
SHA-256: 2a8a678b00b88eb2988d46646c98dbc7fda04f5ea7f36709023af8150bca8ef2
font_01_sfnt_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 14820 bytes
SHA-256: 3e3f0404029e2160d8ad90e01ed32c57ab503b2c873918df0916d97c1f5acbd8
font_02_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1