Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7d41e7bc143013…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 14:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fd2036303cac69d9ce899acb3dddfd5 SHA-1: 01919b8c3f575013e72a85d615aa115a28bce2e5 SHA-256: 8e7d41e7bc1430130680e20f43f4db8d402627c207eb6d258f9b4e3b815a0dec
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phishing content. The presence of multiple embedded URLs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f01717fd---birekamigokugeni.pdf In PDF document text
    • http://sushikyototogo.com/uploads/files/gonomoposubi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160964448b239f---disapufubadat.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fc471ef09c0c445d06f3767c766933b7/xujapipe.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/13373706644.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/83175367087.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/054c56ac03e9b0d8c65ac6fe1887536a/bujubemoronoretafezuvawi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e447c01030---bulakigojutipezewid.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c667663e02d5555594443c47502f01fc/zarosef.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/bavad.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/jatakaxeminaz.pdfIn PDF document text
    • https://anaksemut.com/contents//files/lipapix.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025630887c---58746575034.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/zemikulegima.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9105eadef0---74806535321.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/283e5316b974dgn0tsm2b4d9g5/lewemojun.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/tewenozekemun.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/61274573427.pdfIn PDF document text
    • https://topupdana.com/contents//files/42833415089.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/47sfl5h6eltajaagnr5i9fd6e4/50736802066.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8913990dcb---23623483592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=osrs+fastest+99sPDF 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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 10040 bytes
SHA-256: d9d74bcb844eef6b5d3dd82ea5564e19240fc216d8ba75e0a4c64a714d328e68
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 16784 bytes
SHA-256: e099f240bfbb2179bcf0674c026ff3929fc9244acf5f9b06c7eafabbba38fa55
font_02_sfnt_off00012c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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