Malicious PDF — malware analysis report

Static analysis result for SHA-256 4094f4124da1fb70…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 05:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1766315dee451801552227ced12de3b SHA-1: b1e65d5e9b5ea1e5883fa74bb7c7cba87ffdaf31 SHA-256: 4094f4124da1fb70b4c638d28b7dcccada5db0d15bc3154d4a4b16db901ff498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to domains that are either compromised or disposable, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://thegioidongphuc.net/ckfinder/userfiles/files/51743486071.pdf In PDF document text
    • http://verynailscm.com/user_img/file/72626535157.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/tarogomazamidaxesamawo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1cc33d154---82375519732.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/848092a712d336c7ece7544099e226fe/20912466754.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff2409b538---93502900843.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098fc2f25763---59119870792.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a15b389---58918971870.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/filufupegupuvugasasetasep.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/32512323917.pdfIn PDF document text
    • http://shosholoza.de/file/1106972167.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/2495300445.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833314c4602---380542037.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/babifozufekifetotutidoveg.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d40bb8590---27010210354.pdfIn PDF document text
    • http://greenld.com/userfiles/sarirufofalak.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/71475951497.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf982725---78154019000.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/33382318540.pdfIn PDF document text
    • http://aa-nusd.jp/62638041784.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9fb4a72a---14675639338.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/33078156867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=digital+media+strategy+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000c00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 16240 bytes
SHA-256: 441196d177e211eaedb0d346032330c869cf3fadcf11b9966fdc70438688151b
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 10732 bytes
SHA-256: 33c17c30b32778739eceea07b84a2e5a34ee10bb05ceecaa94776fa282b3c7ee

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