Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a64fdd631a6d089…

MALICIOUS

PDF

152.7 KB Created: 2021-05-30 12:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8594e2873955d5fd10d05184b17cb7ec SHA-1: 0eed429cfaa2a90bf4c4eeb5b34aff064302c36c SHA-256: 4a64fdd631a6d08989100dc3087934bc62fd4c565e438d9a2f8698f4bd4971d6
154 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites hosting PDF files, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9188

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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3301e1f3---39133006435.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a505abed8bd---mofitelotenajuzitib.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5f6eff8f---jowanukijumutigejogi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/23100550965.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/17057629821.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/622e24784b9ac9e73e85ced702bb6a65/46261628045.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/sowemivado.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/53f1d0b54fbba0a3d1626e7d1178397c/44764675832.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084540c63781---mazoma.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f1c5140a694d33f15320ad1c3f60046/tazatoxugiboremupavukokew.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jne6c9al313lp1aqmuhq50u0n9/jikujewanibosiride.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2jkl1ahvf3143s6v1qi0t2cahr/kuparupekitugavakeg.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/44gpln119bk1502dvncbmm43vp/xasidu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/e9j6evprnvjbcgur9mlps561jf/66421210835.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d2c84eca---vukidimasefedol.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a294f036b---dilosudopag.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbc94bc96---nepasanepivuzudad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ethiopian+grade+9+physics+student+textbook+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC37 22744 bytes
SHA-256: 8729d02d0ccc6c2f6aacb64f386db4cecbf5e4fa1f364dd8bb3210b3aeea785a
font_01_sfnt_off000234b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234B5 5872 bytes
SHA-256: f9bee147761e935ed4944b378595a5c3e1b0b40d6b1cb64b2c901d16dff4899c

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