Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e78da66015645bd…

MALICIOUS

PDF

38.7 KB Created: 2021-06-29 05:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47d85a77de8add4abf410491f5bce3ce SHA-1: f7c761eeb282bc311de82da1322ac81fbd7b4fc4 SHA-256: 9e78da66015645bd28eca416b5f2b125563fa61f576df786fa06dcd851b07bc4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF employs an image-only lure, a common tactic for phishing or malware distribution, as indicated by the 'PDF_IMAGE_LURE' heuristic. Multiple heuristics point to the document being a link farm hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8611

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 38 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://archism.ru/uplcv?utm_term=quotes+from+alchemist+book PDF link annotation
    • https://hanmarklight.com/UploadFile/files/gisojuzi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/hhf3ifl5ifsbaarmse4b4d3ihh/81971150413.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/15486406146.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/dixofaziguxesorisafeluvep.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/lonad.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/df4c5f512ea878f8cae7caea1e0d6b08/tatalixotofoxupa.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/469c2a637987178d239fbbca351b26ba/98301069230.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/lejej.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/37795814112.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35c673f97---pifovonofanakiguw.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f7315327---47373158305.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c503c216cdd99c9fa938b3442d7f956a/38058658108.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/64gckh6etkfke5httdnadoib4u/dijexuruvejavukabo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/noperuzixuvalatixone.pdfIn PDF document text

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