Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb9f9baefc9f64a…

MALICIOUS

PDF

93.5 KB Created: 2021-08-01 01:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0f8301eae64a9b6a328081fb3b7170d SHA-1: 4c06bc3b2f229cd1bb541ec5010486d93b43b636 SHA-256: 7fb9f9baefc9f64aced627b638616bbfe99ddefee8fd27fa6928d655bae9f995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of multiple external URIs and the classification as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=jack+reed+a+killer+among+us+dvd PDF link annotation
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/80350fd5fd46cdccbd827025dc9b1f1a/bafumudarolagogevevojesu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a69aa06c---99532093614.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/zibimakebukoboratijoz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608067f870ebd---54495680006.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bivodajiwelefobopu.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/34091842650.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/80329518069.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7ea856734c2d574e74fd90fb2999718e/xakemedun.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3a59513da60e498d5a0b89b926e8cec2/newuximepowajoxubomefax.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b9329cdd---rareravizoziz.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3e38fc0f71e256816d0047b35925bcb5/92928291806.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/65649641811.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68f2a4e10---14329888130.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0rh0migeqnliuo0sinf0u8h5eo/dijolamovaxi.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/setumimuka.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/93230155705.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcd274184---33853104930.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cda2c11ea---pisetizanato.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e6ccd9629534777fcad40e375f6310c3/rigamifalidobamujitud.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a6f839ee9---ritutenukevumudasanevuvig.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7bf11e4b65110ac739e95d445d1fa019/64087932361.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071881d3067f---kigesadu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/78401523110.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/tuduwapuzelomotaluxux.pdfIn PDF document text
    • 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_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 17996 bytes
SHA-256: c4d3966b5a1cfb3eb8806df5c12170c5e3757f3baa40f9cf084e8a6cccfc1b8f
font_01_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 10864 bytes
SHA-256: 071b04ac68f66d3c24cf5ca95935669f39a1aa784306bed7238fdab9f056bc6f
font_02_sfnt_off00014e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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