Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8be6518d7357b1…

MALICIOUS

PDF

71.7 KB Created: 2021-06-11 10:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b3309df1523b1843d024108bb6c5ce0e SHA-1: ceb2b7458445c45c26f1b6bef307e2556c807155 SHA-256: 8f8be6518d7357b1d9e7388e3fd8aebae3d1baed7210264d2eef6c310c1b80d6
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs pointing to potentially malicious content supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7734

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://medvor.ru/uplcv?utm_term=in+the+bright+places PDF link annotation
    • https://abeess.com/userfiles/file/76340732882.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e5d7382a---wanuvo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f59ed9d2---73034389972.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccec34c162---91630564463.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1c3044a525720d6bcabd7c43716921c3/berulujizaboje.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jidexej.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/95079425199.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7ccb2447---jijedegirusimige.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/98375397390.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/39931946362.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/629993457.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ab71b7b6fbe712f6f71fd5bb65d8d1b8/97828792013.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9a926096---godele.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5l8afenadi6jo0lts2vhr7rct4/xiwubaja.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e77a11a18---55389917775.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 2912 bytes
SHA-256: 488516930b66b97f1e39ec0df5d6e6de5e2098fed37c66961f817e89628c6223
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 5272 bytes
SHA-256: c5d4290566f775486facd6ce533e51dbe7d5f5320b8eacd7c8096ce37101a512
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 10532 bytes
SHA-256: e2b0c668c85fd5a114bbba7da643a16bed159926296bb593e94710bde4a52a33

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