Malicious PDF — malware analysis report

Static analysis result for SHA-256 664c3e697923b0be…

MALICIOUS

PDF

62.3 KB Created: 2021-09-24 05:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfe925e11ea60bfb9ffd458e59db0452 SHA-1: 5d45cef0715c2d5631c5f5ee10fca9d081266e71 SHA-256: 664c3e697923b0be0846067a0b17fe894fca3ef073303e9c19ca2607847e039b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=where+can+i+watch+promising+young+woman+in+canada PDF link annotation
    • https://poganyvolgyi.hu/userfiles/file/bibanawodilebegag.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6c9a02ff6.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/vusamub.pdfIn PDF document text
    • http://aurora-c.jp/files/files/gitoja.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/33906202873.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/8773466719.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/zikelin.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/tobewepefivusipadaj.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vrvh44plj3j3qmcpmabim7v87g/87448532629.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/50886473878.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/50576541145.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/518e515438235da034bd3473c463dacf/nifajepitanogilexin.pdfIn PDF document text
    • https://stotex.rs/files/56254799355.pdfIn PDF document text
    • https://onlinendttraining.net/files/56037671822.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/46600363107.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161381608e34e2---12973378134.pdfIn PDF document text
    • http://biosite.ru/images/news/file/lalotigesewu.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/nuxuz.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/bitasamatasilafoxaxuk.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/worosivifiniguvobo.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/mixoluto.pdfIn PDF document text
    • http://jljemc.com/upload/files/40158135588.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/fagawifax.pdfIn PDF document text
    • http://analhospital.net/file/files/6212704542.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 11208 bytes
SHA-256: f169a2c36ba3679b009e1bcacdc0f91c649d4b6c08e77e83888496145654286c
font_01_sfnt_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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