Malicious PDF — malware analysis report

Static analysis result for SHA-256 be51fb63605f34a6…

MALICIOUS

PDF

81.7 KB Created: 2021-08-20 18:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47afb2c3be7c3172b2017335ed1fa962 SHA-1: b4eabc055cdb1e34976a53c5b9bcbe340f8b66d7 SHA-256: be51fb63605f34a661b19a4d04a75a0a010ee927d3e8dbaa2e4924a35c925a6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/83653611179.pdf In PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66595432358.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/15340285476.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/rikutemine.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c584f13e734---nofibirebabelofivali.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/750bbf4080e477c73758a2b158323865/18118128954.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/79666754986.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec11aa04c1---dotikapel.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ii0214shv297qci9iuhjoicp7u/puxagatevulutuwa.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/fevovoporukolikutawa.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/rumikodeguke.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3bb157e3e48a2c1585471a8de8447094/95308571089.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3db8cba41---rozadalazefupinuxevanuwa.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/82790401251.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bb4d9298d841e6b5b1f684d4f4b84c80/51285388273.pdfIn PDF document text
    • http://houselandia.ru/files/jalawukuzu.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/sewizamigorixonijopobuvi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4adf39a60f503021b310e59d368f102b/64005375434.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/92444863420.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/lazigotuxudu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c7fc09bca---55382016422.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db90cd7547d---60142519430.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/durufifadud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+shin+budokai+6+psp+free+downloadPDF 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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 11328 bytes
SHA-256: c82e7bd20f5ef04e8b46380d876e02549e35c4c518c2c19f9a007afc2d556633
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 16588 bytes
SHA-256: 3cb6fafe727a94be46459740f294ea7c28b795207eac40d3088b950248811c96

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