Malicious PDF — malware analysis report

Static analysis result for SHA-256 730851378491fd50…

MALICIOUS

PDF

99.9 KB Created: 2021-06-27 05:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b38dee294a71defaed842396902fd5ce SHA-1: cda987cd1e4d5bb7efadaefdc638e68780ce9f10 SHA-256: 730851378491fd50ee7aa6148b2d10212caa057795d847c65f1ba19fadcfaf21
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qc9nu7r61ccttggcerepdel7u6/sotimofaposegekobid.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62528ab35---sewutaras.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xibadimexonaraw.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/14906689985.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec0976062---gakosar.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/kawujagasusipabagofuziluv.pdfIn PDF document text
    • http://rotang.net/userfiles/file/redelok.pdfIn PDF document text
    • https://777mto.com/contents//files/bediv.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xivutulodofegunopubesadog.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/138ad55f5195b9b32cad0a95efd6ff72/99418170686.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wigoxugowipab.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g9lj3vbcpod5bco3kdje13jsoa/15045769563.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a836b321059d8b7f58cf78220d32995a/wojusefizu.pdfIn PDF document text
    • https://go2germany.ru/files/file/verurukonuturijub.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c870452267---jaxejarupogefosivof.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7d01ef4ce63708975e4acc2fc135a6b2/70773190774.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/zaporupukujepakez.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/40d088e2262a2b171813dd0dab205abe/mokifujidejokabuwo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094737b9bf3c---pigivijet.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5f1efoqqlva5peoovcetrg7s2/24508657330.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zevarupevojazozoxad.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9mnku4u3h4k72ag1p88oia8vh/gadezasalaxagoru.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc3d7a289---36459232035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=one+sample+t+test+example+problems+with+solutionsPDF 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_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 19636 bytes
SHA-256: c83ff4ffc4379c1ad31ac579452a773e8bf8aac3380cfbe0a9ce0fd8466a2f81
font_02_sfnt_off000168a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A7 10968 bytes
SHA-256: 54bf3a6a454a1cac5972437144676b367118b4dcae1a6b3e375d8ced299b91a6

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