Malicious PDF — malware analysis report

Static analysis result for SHA-256 93789e218dac6749…

MALICIOUS

PDF

73.1 KB Created: 2021-06-08 23:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d6304f448e27116064af14a72eb997eb SHA-1: bc85f54bbb37f8c1756c00253e53c46e08e29321 SHA-256: 93789e218dac67491a94b21d1782a0e9ed5711076f894a1b7a93fafa4d472708
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a malicious document.

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://cructi.ru/uplcv?utm_term=skam+france+season+1+episodes PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c2354458acc560d5e99bc8ad131b5b7c/nikido.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af5cb572422---popazif.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b7n62g1f2cnmusskabslbtt5g1/19277992253.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xigamafatekufanebukos.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb8890ee6---86800622841.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607446318ea7c---80752999186.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3e900b5cef---kenevulusimiluvigaz.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607267f2ecc41---nazawosoxafimejog.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/81251931688.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/plkkup4m77bo94aiiqe7peuoa8/93566560525.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c74dbf6d---loxinur.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080531b5f688---63054891577.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vonuvegif.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfa8629f086a7e5a7409bbc14722df11/sobaledetarolifojodun.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6481eb42b5---gisubinixafufajewepuji.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/93edf6f6495c7c22bc56397681dd2279/85680939132.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/o2bsji5qu77e23p1518t3e6jss/zaruxod.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 5488 bytes
SHA-256: 59d84338a41d933128156f4d46bd5730065c8fa47ab870e9759d314c8c0e74e0
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 10316 bytes
SHA-256: f4110bd027044e190fc0359971a2f04ea16f9a05b038a60a8bbee8af98273ac7