Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85a42633924a58a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 12:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77f4435f53cc98562e2553630bec58c4 SHA-1: 973ad38bc7c27b09be8d211d76eea42cade35a68 SHA-256: c85a42633924a58ae958e51705dce39830ba5c39f1a1df7d4e518dddcaeb9e3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The presence of JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613507d83bcfe---4643816372.pdf In PDF document text
    • https://lacausedeslivres.com/userfiles/file/19312024845.pdfIn PDF document text
    • http://lecostationery.com/files/file/rifuzikatapelisoruku.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/26757787769.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/bofisijisilozovezab.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/lozad.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/19187924106.pdfIn PDF document text
    • https://dalba.net/other_files/File/36488491555.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lemekemu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/vejonikexafajaminosu.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/54152130154.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/49277403508.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rezevovuw.pdfIn PDF document text
    • http://benly-carson.com/product/files/63299411384.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/judowuze.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/23034866709.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c30f99752---64886399296.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3867b389f1d9c9660bd1ac4707cea2d2/vumusunevaw.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/84054832402.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ccf66edb433d67e32cbc85a073a15bb2/19419913238.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/64926432930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+premium+music+player+for+androidPDF 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_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 11048 bytes
SHA-256: f4f4ceb40dc3c27c49882f6e4c778102ad455f1e030e4627c9ec278ed4812aaf
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 16596 bytes
SHA-256: f8d787e14a3a160ecfb6f9ca4212816c7ef177ca7271255b39e640cec090fe0f

Open this report in the interactive analyzer, or submit your own file for analysis.