Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f2bbfd399bbe1a…

MALICIOUS

PDF

38.7 KB Created: 2021-07-17 07:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b5b15493bf228b10b3db7f6593552f9 SHA-1: 97e023e87a372c27d86027de4d9f1e4df8082880 SHA-256: c4f2bbfd399bbe1a0420721750f9022a745c77c97e1009015818ecac70ce88b5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF employs a common screenshot lure technique, indicated by its small size and image-heavy content, to trick users into clicking embedded links. Multiple heuristics confirm the presence of link farms pointing to compromised CMS uploads, suggesting the PDF is designed to redirect users to malicious sites for phishing or further payload delivery. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/s5p580fq8bcp3ahmke1s2drk34/35422260831.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75ad374a0c---fobipirepolem.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e85de9d28b---juxilonininakat.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/03/bobuvojulodobuxewanuzi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/56327e3bd318ba0066cf50e7ee5d9138/78783791976.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d9463e8e5---2985384115.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/zabomowifezuwogapuxusoxet.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93de0f421---lebasobibaviwo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c28db978c3b---90684452246.pdfIn PDF document text
    • http://netflor.pl/upload/File/gawemodovad.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/suwedewubepurotu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/25765202248.pdfIn PDF document text
    • https://abeess.com/userfiles/file/bumudoduzusimadoven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=that+70s+show+triviaPDF link annotation

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