Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce266bc66e7233b…

MALICIOUS

PDF

135.6 KB Created: 2021-06-13 11:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3a76815a570fe3cf1fc54c55700b0727 SHA-1: 4bb21acb7a3047156c5b9a0c56ceca6972e16d32 SHA-256: 2ce266bc66e7233bb581805ba35f8a611f4a3b51268126cb3f5f8b5270250f62
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=tamilgun+chennai+express PDF link annotation
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5e56fc71---44130619684.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/pujul.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/93443259034.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edd9646e3---51025624070.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4f3646b9---gumakopetijireduk.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608769982731f---rujugawazuz.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/xelisikonevowe.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/69452723683.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980e9c1626c---kawanuzezogawikifa.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/39000590907.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b475725e1dc---wikasuxovivugijuvuw.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8d6a8ed8---gogiluz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2s802j9bhf47bb6asqt8dapc91/lefosowasuniwidej.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r7ccb65e038mfr2b589v5qe9k7/pijoraxezogetilifoliw.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1561bad526151082105481abbb4ac5f9/zomuzipepixi.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/48717530251.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_off0001d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7E9 5364 bytes
SHA-256: a64daa330e65b803591eccd72c59ccafb597171db5d6d882b7bc42e1495aea24
font_01_sfnt_off0001ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA00 11092 bytes
SHA-256: d1867f5e2ef3f6d94549e12e2c4cd4e01a984d31267856e70467731832fc0972