Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2289f1747b61bc8…

MALICIOUS

PDF

122.0 KB Created: 2021-06-23 04:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3951c8786aea3c89f011550b3c4e684c SHA-1: f22dce07b86d5b320222f6192e5840ee65cf03c0 SHA-256: c2289f1747b61bc89007b82db8f77ae91270c2d99fa5c2950ff1408f550be74e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as a phishing trojan. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=physics+ch+10+answers PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f425f0a43d---34227130641.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7da74cb3---76067703013.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/danewidavodomufisiwodut.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bc7d4234---fipegozixoleji.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hvchh77h4mfl3j6kco2pek199k/zetorezileleremez.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2c082f5d6fe6cc9db23d3921f2609d18/62044847817.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1a6f0ff6---72874500687.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/83cefa02fb50809cdd845320eb4006fb/78509360506.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cae26e5a8---kemoveme.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f9705a2fb6e9da1c22f2528ff4015a82/85549165944.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ccb520535498c6e280ccd7d23d646560/fokutivojetazijip.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae95cd9cf---60254322602.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/95920795317.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/fufinedasumumepomokibud.pdfIn PDF document text
    • https://siroyensao.com/upload/files/83170156158.pdfIn PDF document text
    • http://changdahk.com/upload/jofowezapelotut.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/xunefuzoronowavilinajol.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3c45d2f36f3b24c19afb67a14eff11b1/74536530833.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00018898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18898 5244 bytes
SHA-256: f7a2ef0dc6d2f5d88adef5a6168174ef2e5c5e6d15a5916a65d8d3320c36972a
font_01_sfnt_off00019a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A82 12456 bytes
SHA-256: 0e7fd75227d22c5b6c1e37548738cead44588204bfe59026e2898b8d7d423184
font_02_sfnt_off0001c503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C503 16288 bytes
SHA-256: d45d6b6fcb6ba9cb60aafa222c523e556d76d91b267897bdf12614801f89c329

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