Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f538ae853b1a78…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 08:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 443cd9fafcd0430a24595b1a6510de54 SHA-1: e95d6e80bf0d4363f71e7997f21c85bf4ce5b021 SHA-256: 73f538ae853b1a782f87d18da41fecdfbd7c4d46a72b87f6d347d53a20d6fb1b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's intent is to trick users into revealing recovery secrets or private keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0fd5c860e8abeb7c0a0c8d9e6e602458/rovurowukaju.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2ccebefccb86139cd85936bfeb0ef1c7/kigufipazokural.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1bbd9a6f50c950b71091a70c785cd987/82813340172.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/cea4b4c2f1f6bd97c4a689dbb13e938d/94248387806.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/98226264286.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5e5092591047259ff1b56a5755e5f471/disubu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6c05c884---zukawop.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81a26cc6c---41747369953.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160984d5886ddc---wajonefumigifosasixa.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/16035471108.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/40926634298.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/19488355969.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd71f17f1---gaveraxokabepaduwojekikuf.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/35175313229.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6f2d26ed8c9861954361520da29cec22/kosab.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gojewo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8145344256---vosomuzizevafot.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac88291bf---gokaloruzamoniwe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/fifevesizelisisegevikuwon.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/08e9fad72a64b152936ac106089c54a7/1000722454.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/tudovimikililazive.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1b9c34b9---rabezevozefifevunit.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/vinarovoweredugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=outlook+webmail+phciPDF 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_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 10708 bytes
SHA-256: fec68ce162ff5123179a626850b2b8db0a909eb1ea191dda0356ae8b7bcaa76b
font_02_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 17164 bytes
SHA-256: 85a33517cb214a80862a9ad43d3f7413a87a53dbf94899b96a3acfe5761f7fe1

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