Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4c07a5bcfbd5ae…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 18:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b50471f188bcf56b27019c1d9ee5bdf6 SHA-1: be0b2d7288290ded878b07a829584aa9ba04904d SHA-256: 7f4c07a5bcfbd5ae7c9d743153402bb54f490fcf98752ff65fd3d9082cafc156
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 a high likelihood of malicious intent. The document contains numerous external links, many hosted on compromised or disposable domains, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

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://cructi.ru/uplcv?utm_term=ad+free+sudoku+app+android PDF link annotation
    • https://kiptep.ru/file/87546581236.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903064818.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/65725515995.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/53799492837.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613300cb0b39c---guzotuku.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/bibutuwerolefizited.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e0e874e0a8fb3b8f72906a38a66b89fc/vedines.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/varuwinekoxej.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/90367822905.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421578e2bf---zonewejavi.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/nojatozep.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/23242835967.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/7089847842.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/27652628911.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631836723.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xibonuzomivupekaze.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/merugokiranipotav.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ut7o70fe8ccokgkgvc70fm3ri0/84343045329.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/64224459342.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/79901425938.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/subopeforewuguripiliwaz.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/zeniru.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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 10520 bytes
SHA-256: 3952c2ad68682ef6e873caf3a37ba1a77adbaed7ed87aefdbdf0e0ac62f41e74
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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