Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51424eeb11a5998…

MALICIOUS

PDF

70.1 KB Created: 2021-05-01 04:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cb145981abbc6c547bc3fa3a6a6224e SHA-1: b81b4456be5efa3c357226adad6494e16bd02689 SHA-256: b51424eeb11a5998426a3f39c247023c0d1bc1d360bd0c80569fd6e7a5db8411
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute further malicious content. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160721571cd6ca---deribirupuxat.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5b4e47ac---banemamunidezokajamo.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nilln6dui3jkioj201porp7n4n/delibuzitofujanabilag.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d29a03974---kodemigenepag.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fd89e347---10000022949.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160782bae1273c---taredoda.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181a5ba272---38515084954.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e81bf42c76---gixizufejusefupe.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b3dee8ee---10984919290.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/mse71ihtodpbsfe8sllsst5j4n/jekotupotalavi.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae2f08a6d---28791216217.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47f8eaa7c---61564117757.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4f3beef689079d415d45f5adff0fa8b2/61932326203.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd343500aa---losura.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/i69sapum730lt7qkp8kirbqkm1/viwaf.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d02028366f1e88160993ce696c325872/56836533825.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=emulator+android+10+mb
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37a.bin
cae7851aff9e26da16ee63dbb3d2797e2d65d74b05c5c91d79ee5c5a4da71874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 4848 bytes

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