Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf6eb36fd87d639…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 23:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66c52c74c84e6d360827c96115565ba3 SHA-1: 5f81d3eb5bfe57ffd6f36ac4321f9cea920a3719 SHA-256: edf6eb36fd87d639b0ba173d6a022b94c15902deceadf10e3d9c4007acc750ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=signal+video+call+safe PDF link annotation
    • https://vleek.com/uploads/files/tabigikoguxisusaxube.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/27412895292.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/simodadafilosaro.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/dimemotebobap.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b8381fa4d7a96abaf9a66379c542ac43/pevugepujamuz.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/pofoguredesasuz.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/guvitikonuwafoxab.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/akuxubadexukukiko.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/4174924664.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/60238325114.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/polazimadew.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/62472717573.pdfIn PDF document text
    • http://tyextractor.com/d/files/66103332710.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d1befc9b1f259158bf6d0dfe6867bd12/jurokomajoda.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/87783701492.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/83758192477.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/59892795729.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/25724564691.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/56769518242.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/78181606504.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/lozufosolisimulofisuxoz.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3f621c44f---87376825931.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6cffcee6b44883818b0b3d53a204dc35/sovarobudixapozukakizepu.pdfIn PDF document text
    • http://raczcsalad.hu/files/damategixo.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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16968 bytes
SHA-256: 7d808d376daa63e242f862756d0b05082d9f719f19703ae7e8ec59420764531f
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10592 bytes
SHA-256: 416067fa6ed288fce94f27c84310fe6bfd33b10a4be980cfd8d2af3f4006cd43
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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