Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdae1d66ad6ed22…

MALICIOUS

PDF

93.0 KB Created: 2021-07-08 00:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 625840ea2b1cd110b71d4942a0e8eedd SHA-1: 9acb9bdf9eb8c6a2347a2c72eadb0c57edc4329b SHA-256: ccdae1d66ad6ed22ad634481b491be5d040ee2bc4f72bd32441b69a67f93680d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9t0hvqusc7v0ppbsts6j1o8d0q/45709199043.pdf In PDF document text
    • https://brod-plovdiv.com/images/68442665028.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3c61c5def4bb2df2a0abcb59af6fda28/85701753635.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a13c66848---pamekigapu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c86668e2029f310cd31e284fb654655c/41230406274.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a2b150e8d269d42a3f06ad13103dcdb9/16414546503.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff0797c92---90527784040.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/xatesimelusiw.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/41017457705.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8d9f1a94---85649019820.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace284414ad---vunodalemirapudaboxid.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/68339516868.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/lagir.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5mn4jmftf00gv715pbq1fu9cu1/lixinigaxevuroxaxitigi.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/4290895447.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/66da07188b5294b95fa46368866e56bd/danezuvuvudipidugodowaz.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/xofegijem.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vepibikigekugewat.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083f87841d97---subopatomovasux.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/fikozibipotirip.pdfIn PDF document text
    • http://pi-consulting.ch/download/sijijakasenasif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=blackmail+charges+usPDF 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_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 10600 bytes
SHA-256: f5c65271195d55fb0184275a5c7cafc9ebd7079bb23f83becb2c89570c6ff77c
font_01_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 18064 bytes
SHA-256: 43393416dba369ea429e6e021bf8d620ab70a78e1a9dbde8ef651d57557b059d
font_02_sfnt_off00014f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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