Malicious PDF — malware analysis report

Static analysis result for SHA-256 9930e85dfc87e0ee…

MALICIOUS

PDF

183.0 KB Created: 2021-06-22 15:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 48096e9cbde50fe51379b6396415d637 SHA-1: 7d84c42129f944dce4e40ed71635a009715dc25e SHA-256: 9930e85dfc87e0eee1987c86f97d75b9017b0b6a1ff8cba06faf1cefff6e3007
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and numerous external links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9220

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 http://okzawidow.pl/img/upload/files/vixufi.pdf In PDF document text
    • http://nature-revive.org/files/file/42577116334.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b5f8ce32---xizubizawadife.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/rokeladeru.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765e7c9b88f---firixipet.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rp65tour10dfi8u7iictphaj0r/ramabulezogewinutorolag.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/17145546921.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4a21330d---27354084879.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/62831967865.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8b5bcd2e5f2a9b2e81c41d371a301f9b/gamototenegejem.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c6c176fb---ponoxenogele.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4660a549fcbf28dd45bef04291e0427b/91819150484.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xobones.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb454b16ac7---zeramaxarogal.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec0cb47d9---36661956698.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/4db5c94384688c0108803842401b370c/medevolama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=d%2526d+college+of+swordsPDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e3d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE3D6 181239 bytes
SHA-256: ad8b373a19dfcfa970a8c96dc9de881eaaee022107a642adbf0af7f2e4971bad

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