Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a5ebc8c55e868c…

MALICIOUS

PDF

100.5 KB Created: 2021-09-03 21:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 05a940dc11e96a54a991a2f54765a2d8 SHA-1: 77c3dc92b875e9594fa2429f764cfd7afa3f585d SHA-256: 86a5ebc8c55e868cbccea332c661003fe2c1b18026209643d39c5c55ed7d862b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crewmak.ru/uplcv?utm_term=habitos+alimenticios+en+estudiantes+universitarios+pdf PDF link annotation
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2c4ab0ed25b830647f72b26e6cbb883a/90379448568.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8040fe34---79302959896.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c934479c---57325689682.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac88da5b0---xirizamumuluzapobo.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/46884202383.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kevud.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/mapunonuxinevazeta.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/53356033104.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/82524156521.pdfIn PDF document text
    • https://paperland.bg/uploads/file/rupavopazavuzaju.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4a0e3156d09b0cea21ff893dfe67b27c/91261956522.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/rebugijevanejipe.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63a4b8718---xogaletepuvesa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c98c2ed9a---zemavosozimogezixifamoxo.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/raketafesakulepizixasulan.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/37582602004.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3fb817640ed9bd93a1dd1746008e8572/gevuf.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e38627be---76996292021.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/kisifupaxazomori.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/zakezujejet.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/rulosejetu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be63e9e66---bunafatakola.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/87466657877.pdfIn PDF document text
    • https://people11people.gr/uploads/File/rojaxor.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_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 11080 bytes
SHA-256: 4333bf877970ec39f894976267b7db2857d7c810fcb3a85cbd336ed199788359
font_01_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 21408 bytes
SHA-256: 9ecf26774ccd2c84421bc05de314be890193bdba16cc791ce7a14a25c3d2c47a
font_02_sfnt_off00016c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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