Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39b8d93635446d1…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 08:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 807273f330d4b4878a218ddd6e1f6b0c SHA-1: a45f5158365ca41b323f7ad6ce2688cbd80a7965 SHA-256: f39b8d93635446d19faa6245e392de46e255673659a9c1a36987f1cd8a1e8e38
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://benardoutlite.com/admin/fckeditor/fckdata/file/disiwi.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adfcb5498---wolafapomat.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/646ejogjq7lf5v6iu2m2n2gvlq/84201497430.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c20976c781b---fekijutipizan.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdd01658987cd71f4d3d1001bb79f40c/63836275756.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/morifuj.pdfIn PDF document text
    • http://nfc.soo.jp/file/xegawoturide.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/38330649216.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/29829775725.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/mivewarogujakefeza.pdfIn PDF document text
    • http://jump360.co/upload/files/20210601163129.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a802405fa85---46245264896.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210809_956FA50F14791C30.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e21fae4e143---63223000611.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16208694115915.pdfIn PDF document text
    • http://sport-way.ru/img/file/sirafekukufutikebaloli.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a9c2cac708127a1c97bc844c314d27a8/67428861875.pdfIn PDF document text
    • https://il-gusto.com/images/file/66672615987.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/048232c8156bbaad1a5323246f4b5bd4/41860000234.pdfIn PDF document text
    • http://beta-rc.com/upload/files/77714489016.pdfIn PDF document text
    • http://superpart.com/files/tuvunakilawebi.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/18657276275.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-08/images/files/16945270521.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/regemezunew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=customer+segmentation+in+banking+industry+pdfPDF 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 11272 bytes
SHA-256: 6e44e65b5fac1d1c1765b676bd9a311f6d61b712a2f1871b563cdfe0647f2b46
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 16788 bytes
SHA-256: 1a9eb3d48214083c0d636b07fdd65b01fe4f4847dab7f407ed2d1b1bda2728f0
font_02_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1