Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b71d23771e564d…

MALICIOUS

PDF

40.3 KB Created: 2021-09-27 21:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d8ab9f732ad143c7b9ff6d7cb8ea029b SHA-1: 9ec0fe1c3326ada1285ad3208a382f63715b0dd1 SHA-256: c4b71d23771e564d661e2543468b5457f69444e8dbfced980c0f276dcfebd3e1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure, indicated by its small size and image-heavy nature, to entice users into clicking embedded links. Multiple heuristics confirm the presence of numerous external links, many hosted on what appear to be compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8574

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 40 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://allytemp.ru/uplcv?utm_term=bowmaster+prelude+app PDF link annotation
    • http://sangtaoad.com/uploads/userfiles/file/36502227196.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/22297205582.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/39274624396.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613276005d752---76073595669.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/kerajizizewuro.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/kedawexifurowafa.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/lejaniforukonamuvez.pdfIn PDF document text
    • https://fishuntpesca.it/file/82994814756.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/jazaz.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/98251148024.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/bokujorederala.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///30413083311.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/79908020087.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161321043c5cc1---kigaxomemufijotana.pdfIn PDF document text
    • http://vit-physio.de/file/janaz.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/sunexok.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/vukokamudesewatod.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/92802257194.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/56843996533.pdfIn PDF document text
    • http://dhf-china.com/d/files/61271359309.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db48ca0ee5---firufiwodat.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/47124614404.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/jumepipa.pdfIn PDF document text

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