Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1a2424c3411136…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 16:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6afa34ac246af2c825fa8a6193e6e783 SHA-1: a9e0c7d8e4f911d0a66771e806ee64530d748111 SHA-256: 4e1a2424c3411136bf357c5998a07122d18225855523ad2829217ea49fa69af2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laserbeautymachine.net/d/files/mugimeneza.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946176695d---fulamobaf.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/45675814770.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/wejimatazomipunomug.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/35746260993.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/zurupijubare.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613189815e4d3---79241060277.pdfIn PDF document text
    • http://villkasz.hu/editor_up/73228109927.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/45712385091.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/bejejisa.pdfIn PDF document text
    • http://sb-78.ru/files/file/641694359.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/nuxolobipuxugox.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/kogitatumofofawi.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/livojuzabebexebivafuxuwi.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/51569329116.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/viserazisagarozeb.pdfIn PDF document text
    • https://svltv.in/userfiles/files/34361424163.pdfIn PDF document text
    • https://zagi.hr/files/29250012207.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4d96a060---5937527944.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce802726de---linip.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/denoviwez.pdfIn PDF document text
    • http://runhouchem.com/upload/files/nelevegedawajuximabazuxep.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/49749455115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+backup+everything+on+your+phonePDF 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_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 17540 bytes
SHA-256: 80382e2d992ba224137db75149e74270eedd603d540e4887cc62e39c8c0805c7
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 11028 bytes
SHA-256: d0398d4ac48287edeaa8b57ab19d2e70c6ae7b275889a016ae6977645118dda8
font_02_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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