Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb3e59861bad6c9…

MALICIOUS

PDF

87.9 KB Created: 2021-07-04 15:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5cb875bfe36a7c714d126fe3c5402b1 SHA-1: 8a3a38456a012929a98cb5bbb029d6eaa323ad45 SHA-256: 7cb3e59861bad6c954ae768cdeb330ba5387913395a1258f7d05bc13530e60d6
156 Risk Score

Malware Insights

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

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 many embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1efea66ea2d82ea8de9b5c6bac24fadf/17004370105.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6f77b091d7db729387714f6992b1841d/95962265679.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/99972214408.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/rodikujagane.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/61224297618.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/056809344ed54da425f7811f29e8a63d/duvideduxisimiz.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/nukujulamedefusajibalipiw.pdfIn PDF document text
    • http://erdbau-rauch.at/xetelakomoniwe.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/zekuribivodeliwixuwogef.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f66b3dd124a9f596c6dfd45d1df4d149/josodexow.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f3c0d45c---tarofixesejugifo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/92607950516.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/fifaresikokepejino.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/9198961387.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c143e0c5a1---57667500834.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8bc78b3c---savuxisunaxonewipiju.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096b95889dd5---teketevesujufaduv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab959439786---95088391618.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5df4123c3647c892a56d644ca43276f5/lobokorugatubizosobezube.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/50227220344.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/ganinale.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/119c4bb73eb00bc4e64597783153744d/daxin.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42bd5aa83---kowetarazotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rice+is+grown+in+which+soilPDF 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_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 17336 bytes
SHA-256: 80200a7cbdd84aa7d08566cc68e93c797481eb726bf10b775229c919f9b1c561
font_01_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 10380 bytes
SHA-256: 91da480f4cca1cfb55e4f68ba701ab9c61d5194aff828c4b7024a2274ea3d9fe
font_02_sfnt_off00013a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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