Malicious PDF — malware analysis report

Static analysis result for SHA-256 695d1f4ba2fe7944…

MALICIOUS

PDF

81.8 KB Created: 2021-10-07 08:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9cc703de7f4f4a6985adf268d6711c1d SHA-1: e72cee4c9d13f737233eb62fc31b7ca53066f441 SHA-256: 695d1f4ba2fe7944b014c25a262746db182b90bcd49f56351f349a6b389a503e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laznia-radom.pl/userfiles/file/90302529106.pdf In PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/1327691134.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/poleragileriv.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/76763624844.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/27780046380.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7d271862---90034517589.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/wofavexenatuxir.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/19057291882.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134AA1665563.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/16627685167.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/78389700225.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/93989194632.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/79086248404.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142967c74ba5---35435645173.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/3068172580.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/kelubasajazawi.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/83801576280.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/21066544430.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/palipuka.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/balelozuk.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021926818.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/dipujavojadilefinudegutid.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c8c1eb40ec---96573394997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=if+your+happy+and+you+know+it+clap+your+handsPDF 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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 17680 bytes
SHA-256: 256eb029048e7cd9c7ea2a233743a2c953f92c303634ef8219c4066930127113
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 10928 bytes
SHA-256: 54083d029ece40c01dff68d740f5597d540adfe43bc0e8cc8fff5b7404b073c5