Malicious PDF — malware analysis report

Static analysis result for SHA-256 d333312a470db50b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-05 09:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c53d0ac469bfe38acf8ff613ed052d8 SHA-1: 16770a27548f9ab2cf18f9f86edef4aa207497f3 SHA-256: d333312a470db50bc3de3cfb7614ff981f216a757980fa572fdc3beb8bd54892
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cc18c808f2141afd97959160f427f3c0/22070276802.pdf In PDF document text
    • https://somogyplusz.hu/files/sufimezuvorer.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/68407400676.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/25160582040.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf43730b97---kumasilogabutisada.pdfIn PDF document text
    • https://go2germany.ru/files/file/vufenarerefodis.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/411a0eaabebef89fe57b8d518d0e8886/fagefinimopakaluwofode.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/pezivulejikoma.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/87451178306.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b3daede4---24481651675.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/vufox.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/67716902689.pdfIn PDF document text
    • http://4bx.pl/public/file/fapatijololiladofujipeb.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/wemukigalarukibeve.pdfIn PDF document text
    • http://hak-al.com/resimler/files/laguzasojer.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8lqc6h3h1ugfjhkoo0jcngp8ok/13041653986.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/juteraxonizubazeza.pdfIn PDF document text
    • https://akvaguru.hu/user/file/wolazeni.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/dubixuj.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/25411311850.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161104464dc762---nurololimewegelupotome.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/62167712393.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/19679308412.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/42494029788.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/55562020843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=toyota+corolla+2000+repair+manual+free+downloadPDF link annotation
    • 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_off0000b0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 11116 bytes
SHA-256: 60454ac896b7786be83876e88e70e5f07c6d25c1b4dd256e681ede86b39ce421
font_01_sfnt_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 14220 bytes
SHA-256: e3ea98f638b197c4cc77e6a6e38757b7e192cfbce3ca6035bf773ac0ce15d7ab
font_02_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1