Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59b76595f524e85…

MALICIOUS

PDF

71.0 KB Created: 2021-07-27 15:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fde9531611f1029e34ee045a61e6c5b0 SHA-1: 68f8db4e1d85a025e243ea8682fce2905980f375 SHA-256: d59b76595f524e85a9954e858b839fe5502385be3969a725a189d23919175784
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to redirect users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://montaze.org/democms/userfiles/file/befedunerizi.pdf In PDF document text
    • http://hesexpo.com/img/editor/image/file/58939622133.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kuxafitizolopovito.pdfIn PDF document text
    • https://isleo.com/i_photos/file/latekarufevege.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/15934037858.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/28894c604f06c0aa5ab399e19081e861/13387888558.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/mowefogigumejokupipujip.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/03f87b97148395a899d3577ddb664455/78180351797.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/wominuzenabibuxugeze.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zugidilogupekejixakim.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/zosojeludigijifuvo.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/xekafolulaxotupe.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/66422931904.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6595c06d78---gisatinesugibomevijo.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/55756207291.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b223ebbcf6---fejasexa.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2919478b5d---xuxomukugevofiregugejabuw.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2cb2808c4fb4ccf8511ca7575b9a6332/94300130417.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dejigumufufudowix.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/90238294921.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a258dd319cf---36494904106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=aa+ab+laut+chalen+movie+song+download+bestwapPDF 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_off0000b50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50E 15372 bytes
SHA-256: 06a7d15aa3b61bd0009c80816c51d320ad1c60263349afbed2a82515f6404433
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 11232 bytes
SHA-256: d7902ec7478f49277463389a61f8129402cdc37dc5993d42948e80e8badf6c10
font_02_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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