Malicious PDF — malware analysis report

Static analysis result for SHA-256 924957b19927233d…

MALICIOUS

PDF

84.3 KB Created: 2021-06-23 10:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c00a643d986aa305fce42987767916e SHA-1: 55972bb68fe0cb3d60348a840d2553f2e9450120 SHA-256: 924957b19927233d6c939be8663faa87b8c80800587d0e0bcb159abf8a17fb88
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=joint+interpolated+motion
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071faeb7b580---99993447746.pdf
    • http://aldo-ins.com/userfiles/file/vivopukum.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ffc37f4d1f31e1b370f3d1b23522298b/86340688444.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6682ea69b4---93960405016.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc988c7c4ac---tabagajolajiwajawitewibu.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8accc6033---64863914050.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef409b103---kaduvag.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/i1qh2e35b9phnlh106sdbcf3tu/tokiwitonotipama.pdf
    • http://hf1968.com/clients/48820/File/66955431225.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/68916520843.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe485c6baa---40258317605.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b148c7b6---pukizokuduresip.pdf
    • https://aonetreks.com/uploads/file/tezatunaze.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608098fbbbee6---69767921500.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/525eb9b9ab401dea37be9b4dc770a798/715758454.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/58984f58580791883d16be14abc1e1c7/804379408.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011512.bin
7a6e56a2ecc4b6ea245f0e38026aa24d891ea9b235b36b7df1a409799d42bf14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 4704 bytes
font_01_sfnt_off000124e5.bin
ffd4a0ac0a538db116d5c03dfac75a0c10087c68515136d161cdaca0371f8e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 11456 bytes

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