Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbae309a3da8a038…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 10:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b1c6c1209a34bd62fc3be780f819f6c SHA-1: 63e28a4f86caa09ad61360294f67c7457e868872 SHA-256: dbae309a3da8a03810a245f7854652b172da922feae58003566777211d881cb7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wxhsbl.com/ckfinder/userfiles/files/20210911_185551.pdf In PDF document text
    • http://irths.com/upload_files/files/91609896746.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/bidipigepisagowipex.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/fokaromupi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/161f775e20960d3fc3964ef8cc9b0301/66058286473.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/19233193803.pdfIn PDF document text
    • http://kftchem.com/upload/files/25984570779.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/tugij.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/salanal.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413928ccf61---58356916477.pdfIn PDF document text
    • http://blgjad.com/upload/files/66250500076.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0e898aafc0d665770e5ac6f4eb0b584a/12631186563.pdfIn PDF document text
    • http://thongthien.vn/upload/files/jolafemuteluris.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/19863496088.pdfIn PDF document text
    • https://denimder.org/resimler/files/nubakozopavoto.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d035edaf---fakuwaj.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/44847819321.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/59814185425.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/62370661600.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/91272986924.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/94901353699.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vugupoba.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/17543763450.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/zugerenukegebit.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/21026000427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+take+screenshot+in+galaxy+note+5PDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/gijujazopusepanenebofewix.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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 17480 bytes
SHA-256: b107f2c6d05ed2bcbf243a42206df0dd802bedd317bcff6aba8961c596b5ef0c
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 11028 bytes
SHA-256: c8f340bed2099f94b8d925420c99136cb5f60a7e94fa9009346e2679c9bc3d3f

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