Malicious PDF — malware analysis report

Static analysis result for SHA-256 6761172f0e42df73…

MALICIOUS

PDF

87.2 KB Created: 2021-08-17 20:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ccc6541ccf16cb5c59dcc45e856fafd5 SHA-1: 0eb323fdf6e4903f6e6fbf4a5934b2196c8257d4 SHA-256: 6761172f0e42df7396f0f4f1f6a1170c9c8eea0e9da368ea5a1aef9566739993
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the heuristic firings and URL analysis confirm the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=libro+tu+puedes+sanar+tu+vida+louise+l+hay PDF link annotation
    • https://kfk-dekoration.dk/images/uploadedimages/file/nemigasiranabekuwuxakikop.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lolinif.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/05279rq3n66n79iqvntcafcgvv/64230721612.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/nivunedilanezew.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/mizogomapuxubaboniruzid.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ae0d8ced---negemosisa.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096179e3bc37---16347446812.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/baganugiwow.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/xaparale.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/libomotolelizoju.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fdbbd8a26---lesewidapupeduvus.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1620911720.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/89326053826.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609409b138928---68160102873.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b9d90ca1aa424a378d8488d7dcbd44aa/81731872096.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712a82054d---zuzunamofirisetuxikaj.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/d9tnuvkdonn9cafq183lgdsuj0/80650198227.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c057fadd7e1f314075f4c5aab49bbcea/kizuwawigasitef.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098455eb8bcd---lixosovemixine.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/75364205589.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/73865388639.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/87d693cf56e4b6154038a47db1b54fb4/vuduzadexojevipev.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_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 18812 bytes
SHA-256: 05502ed79b2b5a97432a5d57cb4432808cf02bd9ab60a370a2a60bb96426f802
font_02_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 10864 bytes
SHA-256: 0d7c0324f1ba5706599c4111de152417c4311ee00698396948d45f7de750af36

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