Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab92d2cd595da78…

MALICIOUS

PDF

62.3 KB Created: 2021-09-26 20:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9225c9772d5cb1a9e7ff7ead91d9805 SHA-1: 97833791717c5b2a32c155ae1b3a669546df4462 SHA-256: 2ab92d2cd595da787d12d2472a856f5063ee71e488b1767b2446665ef87a4089
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of PDF-specific malicious indicators and the nature of the URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9580

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://huntic.ru/uplcv?utm_term=editor+de+office+para+android
    • http://misterholidaysanprisco.it/userfiles/files/vabemame.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/419a68e3eab69d12e524dc351c674ea1/25834151460.pdf
    • https://mondoaudio.it/img/uploaded/file/69924823638.pdf
    • http://aivieksteslaivas.lv/userfiles/file/59377145750.pdf
    • https://skinrepublic.vn/webroot/img/files/numagugav.pdf
    • http://ekhoron21.mn/uploads/files/zewoxupamozijaz.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302770bb9c0---89591441257.pdf
    • https://apartmani-mestrovic-krk.hr/files/23799069971.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/xabesetupopofakupafapesa.pdf
    • http://k12kos.com/ckfinder/userfiles/files/japufopesamaguvitufobes.pdf
    • http://frutapac.com/ckfinder/userfiles/files/sesuxavonuwinarik.pdf
    • https://073741256.com/uploads/files/202109232330492835.pdf
    • https://skywaynepal.com/userfiles/file/tolirofisozupel.pdf
    • http://violetstudio.in/userfiles/file/42748971819.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/mufipajewa.pdf
    • http://clubselectionvoyages.com/images/file/97243809546.pdf
    • https://smartstone.ca/userfiles/files/sojaxifevafu.pdf
    • http://dhleisure.com/ckupload/files/82553196973.pdf
    • https://biroestarsa.hu/uploads/file/pitosifotewexa.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff6cbad67---52684855178.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e2e5b61d---setojopekijibakavij.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f2.bin
1b1963a13a30ec3ac9f63bfd46cfe87228632db7e866b59e25e1fa21f0bd92d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F2 10384 bytes
font_01_sfnt_off0000d07f.bin
8d3c7216af66b866b2ce8e3aeeebcb31c82fdd319fd1c277418d860c17c19f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 17528 bytes

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