Malicious PDF — malware analysis report

Static analysis result for SHA-256 b711cadc1bae32c6…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 17:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64be49f9219715de6f219d58f2020609 SHA-1: b128da1ccecaae0e50260a6daf2f8e400dff77e7 SHA-256: b711cadc1bae32c6464ca5a55e926afb00837c88653110629c2873f0621d380b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://piscesappliances.com/userfiles/file/razuxolusumurixeg.pdf In PDF document text
    • https://profession-your-dr.com/uploads/files/202109272217037020.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/fozinokilukudetinarofodul.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa09e9b011---totedozide.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c16465f64---79029475723.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20211001050107.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5462887566a9a6f8024d23397f256ca0/37531327333.pdfIn PDF document text
    • http://kdekdyjak.cz/data/82529861181.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/99171129345.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/95137120177.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/dilixefawalikurobid.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/13389423837.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/68191524586.pdfIn PDF document text
    • http://citra.cl/userfiles/file/litumuv.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109030453533689.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/26227653340.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/dudupipawosapu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/96ffc6a782f9c7f0ec45b85e3af372c2/91177120425.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/74393960790.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/mabew.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/zajipogitidowadeviwutuxug.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/puropumunodifawovesaminot.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pilojinaseragotujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=student+exploration+measuring+volume+answersPDF 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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 11164 bytes
SHA-256: 0bcee8faa57acf55aa114653a3a42afb31ed585fcddfc3a9a595ad59cca7441a
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 15544 bytes
SHA-256: 8448c0b2bdfe6081759bdc15b3c3bb0f22b6c25c27dc0ef52cfdfa5271895721
font_02_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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