Malicious PDF — malware analysis report

Static analysis result for SHA-256 8087b63e7f56517e…

MALICIOUS

PDF

79.4 KB Created: 2021-05-07 07:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8fc943c90fdfc3b63c65a8a99e9e963a SHA-1: 7bafc43e7a477a1495f6a0b0086f43433470b1b1 SHA-256: 8087b63e7f56517eb67c1564a62d4d3c681f55c2998ad7f831a7a1c6f87273e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it is a link farm pointing to compromised WordPress upload storage and uses a browser installation lure. While no scripts were extracted, the PDF structure and embedded URLs suggest it is designed to trick users into downloading and executing malicious content, likely by masquerading as a necessary browser update or extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/03b785fce3bc332180ad86b8809a05cc/95924121240.pdf In PDF document text
    • http://krevue.cz/UserFiles/File/33186393616.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/p8j1ojgl4lqu1i7ia043ir8ds1/61679396104.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/dc9554a37056a255914e0b256c1035cf/5868966760.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1ecb528ad44216322e0a9d5b9571a5cb/xojexe.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/99822652033.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/83725d4bc3ab3b188d16b18295283478/tibalititiwoguf.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/214c2d11423f20e83cafec125bcde9c8/55346362656.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/800df86ca04277bd44b51540d610f355/vizeg.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703372ade12---25076828188.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c0dc77936386f5e8adc0d59c8f901c50/69085296444.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f225ccff26---dizowotagewagoxajo.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/66470020257.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/majusunazofovojigibep.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b980e77e---zutaxorezupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=uc+browser+older+version+apk+mirrorPDF 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://scripts.sil.org/OFLIn 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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 5568 bytes
SHA-256: ec0da546ef7fb4684d9b73e5432a6053394994b155c2af408777810414c7e24e
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10664 bytes
SHA-256: b47190df6e17b17377c79cd25017bf6f28d753e6169d53ab1fef2d7333aab901
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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