Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6f68bc5ca59c7e…

MALICIOUS

PDF

78.4 KB Created: 2021-06-29 02:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3131ea42cba417d4e30bb73bde5acd47 SHA-1: 47f94ade5da6a2a54c9d6d659ef20731bb021cd4 SHA-256: 9c6f68bc5ca59c7e6eeff4beaa7e7b69b4297cfc3bd5810aad82c37b728fa64f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/i6cahakqgccus50gl6f1g93cki/31796591939.pdf In PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75309a959e---suxurizowuguwiwitej.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072224fd309c---fonurakader.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cb21c20f---vogopovotufimujata.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/935c7e296c86493d98b01fb06abea8c2/tatuwubipukegofavegoxabig.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da07049b30---mikovuzifelivurujabete.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda10098d8---zusekasive.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6o09i4ali12sc4otohl4drk6l7/guvodag.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/67325f7837778335d0b2ce054fd1b47a/39582024411.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608147c84660f---kusoxugolijavubi.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/3587705846.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ruzakeviruvajumofi.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/44845965838.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m194v328b3tnkrnsa06iakcj4d/63063471003.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/074caa1caab97e3ad2659257bce2c805/pizoxolilavigokakufe.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/702b56ea441bba90bd34ad0ac349453c/binufoz.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/68727668391.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fiwev.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/92def2e435f440ab676e1ea46f479f1b/zipesamevubabiru.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/gerivexifuna.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ppei0ocihc8ljq1hu217c8dme5/kulizat.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf61255787a---kewilimanitagufejij.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/68724750895.pdfIn PDF document text
    • http://goref.ru/files/file/35626430123.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801905e0fcf---22107702592.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/vapamavekixopedopawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=multiple+cname+recordsPDF 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 10768 bytes
SHA-256: 7496d69e9bb9c07dc4195a45fa2700af24435c923aa398d4a53cbab5db25d196
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16996 bytes
SHA-256: 9172771a8bd971c337a6174d54b419d7ea976775e510681db56baef2c063c44d
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1