Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6f50f0644e542f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 21:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b9cc33657bef13a4532f98e9dfb6d06 SHA-1: 95b96bcb0ba1dc4d1c67b9d752ca8fdd2b0dfabd SHA-256: db6f50f0644e542f6618966e6d3f3b8f084b63bae19d5f26a3647c9c8a32ef30
172 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are compromised WordPress sites. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across various domains. The presence of a visual download button further suggests a user-interaction-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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 http://ck-tct.ru/userfiles/file/wevofekobujiwunebatefo.pdf In PDF document text
    • https://mumegram.com/userfiles/file/ralezebi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161032b72bf1f6---83330778151.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f079c81d90ae907307b2d728f1b43fb1/pufomif.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102f3b3bc72a---dukeromivibuxugagavonefud.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13e8708b9---lejewupapivilabikedalure.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/25156010182.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/dazowegiwelezuvumixed.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/42449281522.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/82121608115.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/gikuxuwimukeg.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/xokuba.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/guvuji.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/92760255135.pdfIn PDF document text
    • http://dhf-china.com/d/files/rekikagifaru.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/75093083894.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/98490773326.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/dewutapixopuso.pdfIn PDF document text
    • https://campermagazine.tv/public/file/netimovunafesojukam.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/e74d3836b631a30bfa6f1d415bed9675/46493879874.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/kepepol.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/85594126285.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/60191771283.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/muxopin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bratstvo+crnog+bode%C5%BEa+4+pdfPDF 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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 11080 bytes
SHA-256: 6f5ef1c8c2c10fae87e782451c5cb58b6fbc62cf520192f3436718a5429cd223
font_01_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 19164 bytes
SHA-256: 3a53d8d0c87c104cd553b25e3ff0fd02c190492a9958fbbd4ade72b5678e04b0
font_02_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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