Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ad061f0873bdaf…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 02:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44962a5f252b0f210359a842caa901af SHA-1: f6babb9b046964e96c8a30c74c039d46d1e2ddc3 SHA-256: 40ad061f0873bdaf4813afc58750ffc219bae8acedb29d064d8db794367834ed
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms and disposable domains. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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://ketchas.ru/uplcv?utm_term=watch+family+man+season+2+watch+online+free PDF link annotation
    • https://tumujerrusa.com/userfiles/ligagebonajipata.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109091613419463.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0e147535---bevufikozugimokoz.pdfIn PDF document text
    • https://bdata.vn/upload/files/42107480557.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d1e4dd71b25948f21bb4738d54bee9b2/82010526688.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/25256709946.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/64846240259.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/senil.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/kemonurulegopofovi.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/131950368259.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/mirafuvazoka.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/pinon.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b33f1c85---jawipozubodopilolajiru.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/68408420098.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/50317384250.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/52357113538.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109131850374623.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bupabafeposajibajilado.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210908110159.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/40732569095.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nazakikike.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/91620469338.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10912 bytes
SHA-256: 101f9bc09c29e630a95203d30c95169204b8604513611c96266ca4be69db9300
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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