Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b9d101e5fda38e…

MALICIOUS

PDF

97.5 KB Created: 2021-09-04 09:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24dbb25db300a4abcfa3b7625e080a83 SHA-1: 60f7ec6de41fb031c76d1415670b0a7376268190 SHA-256: 84b9d101e5fda38e976221aa6b50b2021f09f549713b9d525dc3c215285563d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for hosting or redirecting malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=nuance+pdf+standard+review PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a741ce1c5---rizuzawim.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2b38ac142184ccb2bc5f0f9abc7d5f1d/jibisizasowevikotut.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73663d13b0---81725791938.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bbad6afd9---46784382511.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/morurolerutukijilatesofuw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb76188dab7---waxojigojemimarenazu.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xabavasotixozuvuxozot.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e9595ef2---mabiv.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/312e414df3f2fc0be8a7ca187310a2ae/jibuwuredagunuboduvomu.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/16706760178.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4b033918---motolinilikenaguran.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a1194a836895c3365eee090f574c243d/rakemuvapofabokanemaz.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fa183f6f7---sixijulijemewu.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/wiravoxabikuwepu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ojr4jb12tms711998ku75nha24/94737810395.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/fonidiwojofubemi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3ic0plnmvedqtqch9054q8cml5/nowoxajajobuzakupenaz.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0a5b1519---81085864220.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/tonifulaba.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/23888274099.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5db487e6965af1f358566ad672b625af/10287043810.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061405345273499.pdfIn 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://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_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 18508 bytes
SHA-256: 1e100399a3832310ab7a5747373f62492768ac5f1499647dc38fb9541aeeda1a
font_01_sfnt_off000147a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A6 10676 bytes
SHA-256: a96209ca3af3bb76a548ee691fe9320275ade721de4eb21842eb8ad62fd23628
font_02_sfnt_off00016056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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