Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c894a7302d5ea6…

MALICIOUS

PDF

76.3 KB Created: 2021-10-06 21:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 972eb60348b828790288e2d3f66b3e7b SHA-1: 91cade879e5b919016558c69c01b0b2b82e28d17 SHA-256: 59c894a7302d5ea644497e81a8e5e3001c974254e76b7f5f8b4d0a15b22b18a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and was detected by ClamAV as a phishing trojan. The document contains numerous URLs, many of which point to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://xn--z4qq44i.tw/upload/actfiles/tuforedebugijiloreduz.pdf In PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/valup.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/82196992395.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/bizaluke.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///benepamu.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/nuwojixejujewaru.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3741193483.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/95773482489.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/74685124560.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/47027558873.pdfIn PDF document text
    • https://eastshop.ir/data/file/latalidodon.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bmtj034rcv8u00c6ug35o6aj0a/ronerorululif.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/37209990154.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/lejoma.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/79288970655.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uub46feeoklsd5gkm939qp2nb9/86215003786.pdfIn PDF document text
    • http://sin-hua.org/userfiles/dorizitadejorinomof.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1615880925332a---pusebami.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/zijolokaliroxusitatupaso.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/napane.pdfIn PDF document text
    • http://melabo.com/upload/files/66643943826.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6b22d7c54556e05db7bf4f6add060b9e/luwitibitepakixutepiwama.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/80aa06b8390f04690b7a002ae390ea0c/85862213817.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/revutitovewesup.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vigesanelogolevuwu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff79b6145c---napomalujuw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a83d6bda---4566243160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=area+of+triangle+in+coordinate+geometry+class+10PDF 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_off0000c351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC351 17568 bytes
SHA-256: 1143a5bd271255074c4ff3a1193521aa70abd0743a560a2a1fb8c87e45504cdf
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 11088 bytes
SHA-256: 15fc8afd6eca5ea43b875324b6d080b7731b1d6189d4a5d4abc866bf7a4ec0c8
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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