Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbdb46a0bb06792…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 10:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6177ce4333d7e9b4379fe1c809f79c40 SHA-1: bd913ede1a184ddad4f2056b3e73872805d86a82 SHA-256: 3fbdb46a0bb06792524be858059191c6ce2cb195d9849432b86d905b038d2021
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links likely lead to phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=hack+world+truck+driving+simulator PDF link annotation
    • http://transportdiverse.com/uploads/files/65314860469.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xorusawoj.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/66118579746.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7baef0f13ad756dd3bb9ad393ade6a5a/raxoluxug.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/66676229495.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/26720558231.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/20217065097.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/tekonelunevosin.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/dokozuxofemubogaxev.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613764c0da2d8---10240568922.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4209656189.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/jizoxunuroputovufok.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/15112407171.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/82947589672.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd4db84a8---zoniligigakizusakelubux.pdfIn PDF document text
    • http://seto.cz/uploads/96623006090.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/52654819058.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b723dc388e---54022678356.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/88122747928.pdfIn PDF document text
    • http://cutskytools.com/d/files/821789400.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/84402484619.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/87884186536.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/vuwodosadubimiredafata.pdfIn PDF document text
    • http://gibisch.info/files/files/95312535058.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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 17124 bytes
SHA-256: 99dd9d3e73f7b5e1741bcd0aab70174acf3efaecb9502335137b3852d72e9feb
font_02_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 10916 bytes
SHA-256: 0f2fbaeb0cfad09f288bf81f14dba91f7fb99a2b37a7cc12e1ac476673ea9146

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