Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41fd39521531b2b…

MALICIOUS

PDF

96.5 KB Created: 2021-07-23 20:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: da0f9adac405e71bb49b2c301e6c2834 SHA-1: fbc052f794d0ce23c97ee1c111cd21aa6827ef23 SHA-256: e41fd39521531b2b86316ee3f21cbfe580fbb1e886a7446dc774fc7584094c4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/df639021c0c9a203e59112decc6369f3/tibebenagulet.pdf In PDF document text
    • http://liavanhaeringen.nl/userfiles/files/xizanobosutuvu.pdfIn PDF document text
    • http://dd-eng.com/files/files/19984570087.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/napizudap.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e6b739ce1d514ea5f69a7250906e757e/dikifibip.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ce8e67d8---61933971171.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/vpp2183tk9b0dfpcb512sumfb3/49561838479.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/52653530696.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gilugigosokodesisiserima.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///46631750190.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77a3fe3e23---gutale.pdfIn PDF document text
    • https://fotovipvercelli.it/file/18623201663.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/e6e98c784817ae7c322ad49bf059e96d/77236524092.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gulutenijejixuguvele.pdfIn PDF document text
    • https://estoniapools.com/contents//files/64513254125.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/89261109529.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/gezevofo.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/55415210349.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=realidades+2+capitulo+2a+examen+2a+page+1+answersPDF 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_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 19040 bytes
SHA-256: 83184082b2b31c1ddddd4b8ed44329216b2334365fd01de3060048de8006beef
font_02_sfnt_off000157f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F2 11364 bytes
SHA-256: efecabc46dd92cdc30e743c45d7a5da0882ce22e39c407006e113e5458571ab4