Malicious PDF — malware analysis report

Static analysis result for SHA-256 131e99ebf23afb87…

MALICIOUS

PDF

76.8 KB Created: 2021-06-05 04:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1b09be1f32ecaf6f930380035733c168 SHA-1: 271dc280e761607b6fa17f7a578df2e42be93891 SHA-256: 131e99ebf23afb876452566a409d3a7c1430ef4b84a8d5ee0ca184196b9be15e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=como+pagar+darf+pelo+santander+internet+banking PDF link annotation
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/88f5606fda1753f718f8e086e134ff1f/gexogidi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7cfcde12da6161e325806bf4ccbcfc4f/puwixe.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608361b00c028---97217755917.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915ff027372---wasijazurija.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b1db52bb21960ec2798c43091e2584fc/87410389365.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084950484b57---fudisa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b57e63b6---15877470617.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bks2qn8iq66eq4pdsq57ssoffj/40064358126.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76309ab2a---96260428675.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/juzuf.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/46012147993.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b3f6c6481057cfedf5ba025d7e1b447c/filexemigewe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ovev9m4hi61t0jodprjc4294l1/zadalopubewewol.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/viralifejubenolipigazi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c8f2c4d7---gomiposomol.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/69205994223.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 5472 bytes
SHA-256: 5f4cb41a4c284534da0c7c6ad57215d84858255e55cdd45b0ef301679e45686c
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 13096 bytes
SHA-256: 7cdc4ccb85e49ef77256c6d8604096bbf5cc5c71dc478177b0b54583aec5d626