Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bf8be92cbe9853…

MALICIOUS

PDF

65.1 KB Created: 2021-06-19 20:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fe71cab74504660bcd608d74976bf2b7 SHA-1: 5965829e7b5b078ab31aaaf20907eda91f5c4bd6 SHA-256: 18bf8be92cbe98532959919ca20c32956e23b0d9ce085586c22ff77b1ef904f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to host further exploit stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

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 https://wastran.ru/uplcv?utm_term=machine+learning+statistics+pdf PDF link annotation
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f3490c6bb05faf22f4d3ece9991cf5cb/kamudoxuz.pdfIn PDF document text
    • http://thedreams.cz/files/21591441187.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/cd4754a9262101f538ff7556b08173db/84024021022.pdfIn PDF document text
    • https://areicon.com/images/file/roboruwonil.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160acc785e8ef0---28789012780.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/1232080709.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff4142244---luromuzagitudidineseki.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55bee013b---58951827892.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ed1d9df1f861a2013bf1aabb62e56faf/vimaxuridak.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/78ff145ecb9c682cea62af112d8f432b/xesixufipige.pdfIn PDF document text
    • http://www.asslar.de/downloads/sijopawe.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b287d3b4c3d---fepovekorukezijavubofono.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/49991228405.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b160f8dc4c0---kinunuvopivibofel.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d0fb1315---8519272136.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aad68b8c5c4---37920647422.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gcmf1gq4ks95l5eptjjminfjf3/61224801953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 5100 bytes
SHA-256: fd6eb2c69a94a595eda2e73ee20b9669af83198cf72814989f1c7e8f48d9ab84

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