Malicious PDF — malware analysis report

Static analysis result for SHA-256 b391b06c914f8cf3…

MALICIOUS

PDF

132.1 KB Created: 2021-08-08 11:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb80906d3cabcca96e8c1e51161f40e5 SHA-1: 3eb9085c2418cf83bf3560b12fa180d9df44c771 SHA-256: b391b06c914f8cf3a873d400c472833ac8a1b4fc5e1ef8bc0148b1fbe7177acb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://championshipsportsrings.com/clients/23492/File/kopaguxob.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f7dc068766d463f2451ae87d6c86970/kenademigavoda.pdfIn PDF document text
    • http://candientushinko.com/images/file/92692675264.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1e74f4b90be40d1c921d8db88039911a/95718802894.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v99c4g8lsucno4pomsl8uh9q87/95327158581.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4e1de7d020a9204923223088284f7956/fasamomevuf.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/eusu5f3aajegt8j4pj4sutqhgc/51470957550.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/55424418806.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/5328909702.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606defc856397---jokukuwebonosefumobi.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/fofila.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/lgkb7v574vim0mg9ov2h5pr9fk/96785021312.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce92d8c608---walarifafutosimawu.pdfIn PDF document text
    • http://lblussana.it/images/file/74962279617.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/39069128370.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/zosoxuxidalebezimakurew.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/5203316330.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/tedota.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835c38bfff---doliwinawemugosufixoleze.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/junipuvisiluniweriwakorev.pdfIn PDF document text
    • http://etnorom.hu/pictures/33245876790.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b7fc8895---20854740388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+catcher+in+the+rye+reading+and+study+guide+answer+keyPDF 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_off0001a080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A080 10840 bytes
SHA-256: 73a8f82f00403c9e197eb10eb831fd9c60ef3ef8433cc652fea327f2d90f1484
font_01_sfnt_off0001b95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B95C 18124 bytes
SHA-256: e8139f3408ead6ced4bf50a3d30f76703cabbbea17e05e82ca370e630cf195b7
font_02_sfnt_off0001e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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