Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b62c1a51d71385…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 16:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d68067b9c47bea86d9f66c85190d4738 SHA-1: c069938439487a4fb7e121830384564432bf6fa9 SHA-256: 96b62c1a51d713851c181e44cdd09e3da4d8952975a247a68ecf831d92eafbaa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1b3686ef4e57699ed252c43be0c77397/52669589748.pdf In PDF document text
    • http://www.urbanwaterways.info/files/xemovudejoxok.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076244328b5f---gonesubomiw.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/47293899522.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe5915b7c7---debixivomixu.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210811135423_9rb5gd.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/cqig5ubkq4iejon47gd374beu2/69445113849.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/75007352890.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/670f2c4988451c138dbf7351ccc14474/68114221251.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/luwarulemofixarebofiguti.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/navakonujewovalevudalud.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-25-07-59-25-11.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/98e979baff45d9057a80ff21a3bfabfe/53011743977.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/92630098540.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a439bfdbb57---49387720251.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/29695337244.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbdad47912---mufavazolupuvolovi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d7abffec7d8a30642b1912bdb581a61d/fuzaterowojulowipetid.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/rekuwapixowarunoduwubimup.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/84363525393.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ceea8c5f0---12622774481.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b50f974e38---karepopanat.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/tevanebizusax.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/38089171858.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082199a51368---zalikigazewed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nippon+life+india+asset+management+ltd+share+pricePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/71acf9b4dc10d50c7c78d8e22155d42d/jiridi.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_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 18916 bytes
SHA-256: 88941a0cc3094c929ecb5d70f0b8bd4deb99f34d055e58946ad510f5deb66871
font_01_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 11044 bytes
SHA-256: 2548666595ab7413a3921d8b10305f12f0fdeb7a8fa3ddde7c16af9394101c7d
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1