Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc5e1ebbccf2a16…

MALICIOUS

PDF

74.2 KB Created: 2021-10-12 09:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 613778a87a40bb4e6a844513269f7a99 SHA-1: db090755bcf93b63dc1e117551cf9b0dd0df3e7d SHA-256: 3dc5e1ebbccf2a162776ddc2ea25cc8fd5b70c683675bcd8b7d788ea0dcef90e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/84de93f41ec42bca058a71a6a95b8824/zafafifoxel.pdf In PDF document text
    • http://lechioutdoor.com/userfiles/file/69239819121.pdfIn PDF document text
    • http://flexa.cz/docs/file/soresawitopisalotopadebi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xebuduxofatalovaxuzija.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/11439688288.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e6fed1e3f947c8ab12c2747e58683745/nesogixaxusikutogasu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/kujurexodabe.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/nosorawujoremowosafasodi.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kowise.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/67278015373.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616154dc1a73c---22407484825.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/kuximininonajumotep.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/povilabuwig.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/54445085493.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219122359443710.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/vakijoxele.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/xumoxujonabifi.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/fawuvimutisexagekoke.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/nokujigojade.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/61037044495.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16153c9aa16a94---18671510052.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/feromidumevurawisanuborex.pdfIn PDF document text
    • https://atiksigorta.com/files/tuvibabalenojaposa.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9t8avsbp0gqh6sn5iir733kudq/tatesopowovubapowosan.pdfIn PDF document text
    • http://dges.in/userfiles/file/66613095318.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/94421915642.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/xomoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=english+grammar+exercises+comparative+and+superlativePDF 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_off0000be0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0D 11212 bytes
SHA-256: 005d0a21dc7ff0cd12d613a2339eddd8a0cacd912a17b784aa5ba2e169a0b7d6
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16780 bytes
SHA-256: 9561cf60aa4bf6eec299524de65f491412d26994bf9d363ff8745c8c493e2f39