Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dea587677475ebb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 21:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1f131a7834ca1a65a7e9a0d47bf125f2 SHA-1: 6f92dad7c82c229b070b1255bce1cd1bb3b0cc7a SHA-256: 9dea587677475ebb57a684a4c697b36ba2be5cceb1c7c13321952cf88f052fa0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of numerous PDF link farm heuristics further supports this. The primary goal appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8a9d4780---7765769567.pdf In PDF document text
    • http://geredekombiservisi.com/userfiles/file/besimujadowojivuxiz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/19f3f9c656cfe2defb41bb3587ee045d/39752264090.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tixorivodumojugovelavuniv.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/jometijilolujusomin.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/jabarifikivulibunarigobew.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609892bd64723---35784759231.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/23540304309.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/58559399781.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b70adcfd3bb8c74aa7fb35460933185e/27602132081.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fcbhcbf4bgj74qte5ka05jeu3e/mivapupoj.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113da1492e73---74039992568.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/ebf6e8c1e0b5a70f83a7d2664df00517/96942036072.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f029c3d59d---nugamimapujazibedono.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862b55f3977---55266671799.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/luxuxelip.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/49157247259.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/18560355076.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/14200250994.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/defawodibatuvul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rhetorical+thesis+statement+examplesPDF 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_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 10784 bytes
SHA-256: 2c17cfb6da070f091f5ce430462c4380af7f714d8a76d24cfb158cac6d1fd026
font_02_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 17444 bytes
SHA-256: 76ffb8cde3bf10bf62dd2196e8c0ef0f67457286f20ea1d6952df6c1679f13ce

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