Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2416d6597f263b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 19:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4460ed4594643559fed4ffefa044e65 SHA-1: 6ba5331b464b445e86589bd8a4d541c6d5e9904f SHA-256: 9c2416d6597f263b01cc8ce33b5d869ab60d9fcd60b00448db699abb5b2067f3
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential distribution or hosting mechanism for malicious content. The PDF's structure and the presence of multiple external links suggest an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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 http://piemonteforyou.it/userfiles/file/50128064866.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/silepowunusidefibaser.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/13289041912.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906151823.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gazijod.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/47444379937.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/90364311216.pdfIn PDF document text
    • http://asfalon.com/__files/file/lotadefesikafage.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138583249ec6---55536709011.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/nelibepejiribixedepan.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45618537335.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e59fc3bf3---toxepuxe.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/safenegibawuvi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5ca20fdf---gufebokefa.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/94305925036.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/ludobomatapu.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/9384747661.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/54808543433.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/dadbc533fa6792ffdea19b5b10c1f53b/12239598781.pdfIn PDF document text
    • https://congchung7.com/upload/file/sibok.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377cf678877---kaginalefojub.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/waxologujuvoji.pdfIn PDF document text
    • http://boldogelet.hu/media/bisitoxobud.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/42323836276.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/54656351751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=estadistica+inferencial+excel+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 10580 bytes
SHA-256: de03c7a9743cccd4738ce4bc260371a9e9bcdc0900827e90ae779b56f664e0e5
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 16596 bytes
SHA-256: 009ec95b5a34db34dcd786be1cff9a8b2476c9717fc4adf9c03fa3449e24375f
font_02_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1