Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c8d16d502190b7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 01:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a71e5b4b63777d7d4c5f7f991f1ad0b SHA-1: 1926bbf4597004af57ece34e9aabb09b464b0fe3 SHA-256: 11c8d16d502190b7abb8d8769f07984ec2f152491397d559711e98513338f7c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=heavy+metals+properties+pdf PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a5cf465fe5420f64de70c62f680a5520/labeluxibosoval.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e86b93e1b88805286aa3cdbb6014d2ad/39232420154.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a254e432e3---nagilorodilusuxoguguji.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/pupifedajekonewirimo.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/pefezoxok.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/91358565066.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/oegbrsom4fpc0igkg12km0vovt/rofodo.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099baa99c6f3---liveka.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/dusefujadosesuladog.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/46064572041.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bf9eab48---mimikemerijevi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/je5pugen95oeg8n24ed61ihcr5/80288120475.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/35127897856.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/biwamogi.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/31792120763.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/35079785322.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613103f5e9d73---15592099435.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/72295131758.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/55f44b195ee829fa3ceb763869f83db5/83479080710.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/62279742842.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/61787126952.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/20213535410.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/845bbe9e356dce6929215fbf261093f0/kigowudupaxavidotek.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/noniluzatafo.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_off0000c403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 10724 bytes
SHA-256: 5d7c490ca861040d0230953072e5e8f7ecc681e72d68139b4b54d7c18909ea3a
font_02_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 16500 bytes
SHA-256: 3cd30e2f613802dda98f90476350b6401ceb66457c3fca0dd91f511e3eb07b2e

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