Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dfccf23aaf16e5…

MALICIOUS

PDF

76.2 KB Created: 2021-06-20 21:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254d5e51781992e7fa9f5adbd141165a SHA-1: c0df0eeebcd215110c2d3d064abdab68d3062597 SHA-256: 81dfccf23aaf16e5bec11088d9a1eaee102f9067b50357c0ccfc55bce7928f8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm hosted on multiple compromised websites, directing users to download a file presented as 'Temple Run oz latest version'. The presence of numerous links on potentially compromised CMS upload directories indicates a deliberate attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c54c738kj0ok22gbc9mpdj72jr/jukevanurotonogigewumure.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bupejakibizuguna.pdf
    • http://bensonlandscape.com/editorData/file/97160034926.pdf
    • http://www.deep2001.com/images/library/File/48349769467.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/kosedudenumoniw.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5b3b8d98---puzemadidazoluron.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8f40cc47---xatatipagufuxoju.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c1f81cbf145e9655c9ccd9669707d7ed/xuwaxutosoledusilug.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086778a9b531---numawozojateg.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/5jnalvq2n8dfe4pkpp7e7nj6qreapat7/17318068778.pdf
    • https://deltarealestate-eg.com/userfiles/file/jelujezidafedoxil.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/bololaxisamuxetekaderovap.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/977b040b1e90e62b431277fcf62ca60e/53963250178.pdf
    • http://frangarcia.eu/upload/file/beguxusumixazusad.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c879d2102---24961753569.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b519a7c4---36002295090.pdf
    • https://liniagdanskzydowo.pl/files/78121211739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=temple+run+oz+latest+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdb.bin
c0d8ab344e9e6e500793020fefdec06f69a3b84fae506f181d1136b666519be7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 4904 bytes
font_01_sfnt_off0000f070.bin
a520d4a107fb6784cf7f4aa4b7a955c2e3c3bae2fcae5f5758d2598267cb2989
pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 10828 bytes
font_02_sfnt_off00011542.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 4324 bytes