Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1357b85f4198c2…

MALICIOUS

PDF

62.3 KB Created: 2021-09-17 09:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 219a2063af266519f1ccec2f9d632560 SHA-1: 907e336e0382a2daff5460206c43b8e586f0fb9f SHA-256: 2d1357b85f4198c2a7a2fef1c6baac5a992dcceff28d48e4eb7ba1028a261fd6
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it's part of a link farm hosted on compromised CMS uploads and disposable hosting, aiming to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 62 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sssmri.com/ckfinder/userfiles/files/37249756546.pdf In PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/27951290751.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8285a2724---xokasimidu.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/8364098849.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/dodorovalopi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/lolelujebi.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f654227da4---46725683367.pdfIn PDF document text
    • http://hiniceshine.com/upload/10557696060.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/69453274985.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/55875998203.pdfIn PDF document text
    • https://grancom.by/upload/docs/jewedafeweduwidaj.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/sodexunas.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/bamadurabogikudatemir.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/96044525735.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/10584737091.pdfIn PDF document text
    • https://lecachet.fr/docs/files/mukagoxidasa.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/77701049226.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e556a90db5---59239387288.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/48986420752.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/9167546988.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/13195825785.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/81950793849.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e3c94b7e560a2364e73742a3a4a33557/71346443147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+download+mod+apk+on+androidPDF link annotation
    • 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_off0000b11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11E 14000 bytes
SHA-256: a5936bcd1c80257d32f0ce7fc4fdecd05bd8ab6abc8bdd06719c4262d2a49017
font_01_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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