Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf4674c173bc33b…

MALICIOUS

PDF

63.6 KB Created: 2021-09-16 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a40cc3944ab38514517164bf61f671b SHA-1: a78af1a07d1e091d50107584bd988e7323e27fe7 SHA-256: 7cf4674c173bc33bc849102396f1caf450fdc017e5921837848ecebf65989058
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, presenting numerous URLs that point to compromised WordPress upload directories, likely to host and distribute further malicious content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8441

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2592df04a87fb4a452b8b70e853d2997/lirisuvevugota.pdf In PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/nibasi.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210913024828.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/fomuduwejelutadinebojaj.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/40887193740.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7d977ae25e6325de52082bf2d50c295/lagurilenapokuxuwadabekop.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48969917368.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ltpc9jl12b50hotm8k9ps37d0g/13771508193.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/50989619143.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/17188895769.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/bijiko.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/lekekelolesetabadofusi.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/zipowovuzesukobamokigovo.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/10140837789.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30475528148.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9a7f3709---16290648987.pdfIn PDF document text
    • http://polletnv.be/uploads/files/49985055301.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/risukifa.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/25711855718.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/21295195963.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/11936794986.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/55703324656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+launcher+designPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 17832 bytes
SHA-256: 2b2cef335572260ff11ee460f1d9f0a8a32187a0b61f3dde32f0d9ad667d81b1

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