Malicious PDF — malware analysis report

Static analysis result for SHA-256 4861fe7ae6237e07…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 13:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a641cd23cef9a6693d5b7918f495771e SHA-1: 133c0cf57c3f1a702243317c3a34ee14f90652a9 SHA-256: 4861fe7ae6237e07d025e2adf0bd94d8bb3cc34904792aebdbe6a6cded967b76
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many external URIs pointing to compromised or disposable hosting. The presence of these links suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=use+of+primogems+genshin+impact PDF link annotation
    • https://hongmao.tw/uploads/files/202109012151534931.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/nomemisage.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/zenexixidunaneworejo.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/16860093125.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/sazarajubudubivogis.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/74532051806.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109050226446799.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f56b6c06c---lexutalopowidos.pdfIn PDF document text
    • http://etkenkalip.com/files/69968627410.pdfIn PDF document text
    • https://jetaime-shop.com/files/25050283420.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/63178218926.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/19276032270.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0a7c1212500222f1761f93220b8ffb5a/70033904106.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/banonapexesivof.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/notebevajaki.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613672c5cd295---powarobepokex.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/90750785875.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/xemisudemogizufikux.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/omo94laavshs3ahtgafvlpukc3/rexaxiwamas.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/duvalapezulasefabanenad.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/tebisuviberogok.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4f2f4574cc5ad6ce16f858a0aee63b0f/gakokomonas.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/nakiletorikomafupezibix.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/warigid.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_off0000bacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACB 16516 bytes
SHA-256: a762a448c02dc94170628d39312165d324f178836067afb4e501ed6a12f47fd4
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 10888 bytes
SHA-256: 53e44dd4400727c3bf44afa818150b759ba67e7d50b0fd00b0af234d466ad26c