Malicious PDF — malware analysis report

Static analysis result for SHA-256 11959bb56dcb9f63…

MALICIOUS

PDF

70.6 KB Created: 2021-06-07 19:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77f0d2e7ee16ef206bf1df754830468e SHA-1: 6cc0d31c76280a222ab8e9af8c9cf6ca08bc1b11 SHA-256: 11959bb56dcb9f636615b690797c47dbffb3c52050b769f8afc01808c9431ccd
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to host and distribute malicious content. The presence of a visual download button further supports a phishing or social engineering lure.

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://catamma.ru/uplcv?utm_term=ardaas+2016+punjabi+movie+free+download
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a169cba89f8---sokaxo.pdf
    • http://aaaexpressac.com/userfiles/file/fupow.pdf
    • http://yishiweb.com/upfiles/files/20210529_050246.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d495e4ce4b---55330390340.pdf
    • https://atlastoursntravels.com/userfiles/file/luvuwa.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722bc3571da---54876019370.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4f33601d313b657bf3e9c1182637fcb5/vaguz.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fc6c3b25844d3aba8491d5875283d10f/24455425285.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160948be9b199c---sifedaxojunoba.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79f51937---xataviridilit.pdf
    • http://munnarinfo.in/userfiles/file/10104763805.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/otrl90fl470861tpgj48dcekjm/31457950919.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4dce2c83f---49959450487.pdf
    • https://mayurherbal.com/userfiles/file/96677746384.pdf
    • https://blugarden.eu/file/satar.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a9514bf3c20d2a0e74f9ad6fd3b63dfd/fafowobadada.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/81820222832.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/0e9870cc9f88a6a39f0f858cceee8d1b/69532815137.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b5b499997bd150a7a5f33836ce7857bd/74750687391.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d580.bin
3d0987ab979cdc557ba537834edaf0042ffacb000ddede240b0433a056389556
pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 6024 bytes
font_01_sfnt_off0000e9fc.bin
763bb92bba2701647b3a0cfd6de8cb90302505d3c75d8f2e0efe683d296be292
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 10520 bytes