Malicious PDF — malware analysis report

Static analysis result for SHA-256 9550db8b833e6c04…

MALICIOUS

PDF

57.8 KB Created: 2021-09-18 23:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5bbc0c336ffb2fd35112b52e72ebc6d SHA-1: 6c7734bc681c5db9c6aa4979e4132b84f731794e SHA-256: 9550db8b833e6c0414df9c06320f52812edf25675a8fc6c1f3a62387daa257fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing sites. The presence of external URIs and link farm characteristics suggests an attempt to lure users to external resources, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

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://huntic.ru/uplcv?utm_term=filhall+mp3+song+download PDF link annotation
    • https://accuratesearch.com/userfiles/file/22835133259.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/skqgio1l5003beurp9dr1jr5o8/bimajeso.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/mezewojudujaziwodituje.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popogesowekamav.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/mna98e8rfbtabunot2l1h179v7/24106000740.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/kupixudilo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sabobotubavemolaken.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08691d9e7---71123865423.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/21337198099.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8f1153ac---tawulasuboni.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed405a26---wijeruweve.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/41647529682.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137eee7771f1---55913086022.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/45635870761.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/94403308538.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/texevuji.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/27212600820.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/tolupanidoxuxumumeduregu.pdfIn PDF document text
    • https://forumsevens.com/images/file/62443045775.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/11162172360.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f8263408---fupobitowemumetegemo.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kisusif.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911012345.pdfIn PDF document text
    • http://starma.pl/files/file/3113283054.pdfIn PDF document text
    • http://tencanpowder.com/d/files/dibobafug.pdfIn PDF document text
    • 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_off0000b9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A5 15744 bytes
SHA-256: 6807ad479f32cea0854467ee35d4cbb333cc40bee4ebf97e38e73c4f4a742ae1

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