Malicious PDF — malware analysis report

Static analysis result for SHA-256 9712fb50d0ac61a9…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 11:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c40c8b454c57ab6db9648b5fcf4dce98 SHA-1: 892e419af189a8922c096de0616d66f96c907829 SHA-256: 9712fb50d0ac61a9430768f55ea9470932ca7b58b32c191ade1fe1b74a2ef745
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple external URLs, many of which are hosted on disposable or compromised domains. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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://chcial.ru/uplcv?utm_term=naruto+slugfest+x+mod PDF link annotation
    • http://limoride.net/gallery/file/jubabapazidavu.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/60720070402.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/kugekusadasomigin.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/88176579517.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/65905798600.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/78448457899.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xibamizetuvoto.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/j5aquhh3ufofgcfn7fok989qv1/wifatuwozudevasoxeseminuz.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/60891896879.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/59071900234.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lulupagoboboxep.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jamifukamudal.pdfIn PDF document text
    • http://dobermanncz.eu/files/daxosel.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/45133838433.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/febolupuni.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5e1bfbd8a72240758e745dc6c89b4fa6/kevoretogisujugisifigukeb.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614d66bfc0b61---7663949609.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a4d1e16067e2d4a3ae9fcf4f240f52a1/19918240617.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/zeturabewosebepifawuwin.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1967713c---39518647605.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/zadovuruzujefu.pdfIn PDF document text
    • https://bfull.ru/uploads/files/58209161791.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/vaboti.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/79232122696.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_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 10680 bytes
SHA-256: e1b3f21dd638c67c9759b753a68ba8ba0118bb5f041f7074aafd012eab0e05b1
font_01_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 17524 bytes
SHA-256: 45a490e527db825b3d831b985470dcb7298bab737f408a994cc6aefbc1ce795f

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