Malicious PDF — malware analysis report

Static analysis result for SHA-256 770ba3a415f626d0…

MALICIOUS

PDF

95.3 KB Created: 2021-07-01 09:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df40da135ed24ca89e2d084d9bc01484 SHA-1: 9b581ed72eb0bd2f06222a89f88f14d18edc0184 SHA-256: 770ba3a415f626d0974bc060fdfff576d9a342a18f41251ffc1c9012428f513d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/98471a189b144961cafead24552881b8/gawatudenowil.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebd07bddc---30893043378.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0494bed8---nopojuguxovurazesawun.pdf
    • https://qnzar.com/files/91832318934.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2e43e8dd33348454e1778fbeb93cd72a/musugod.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7d93a272ab71d89ecc13d04148cab63c/47748448913.pdf
    • http://tubietelbar.hu/uploadfile/84021860781.pdf
    • https://angkalaris.com/contents//files/90697010087.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac138fc0e---buwazeja.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd2af40ed---34277553838.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/radugabomajow.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0370c18f5---96912830315.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070735cde8e0---dulum.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3ddb32edd0eaa09eaea9be17fdd21243/58226944699.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e310fd27db---9669912806.pdf
    • http://www.toeterloeh44.de/files/malipofawuvik.pdf
    • http://dok-vo.ru/userfiles/file/jekorolusibinezikid.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/12dd555f4b7afbebaf05a419ffd3c5f0/73365219175.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105272211074497.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8a3cddf6---kizesejugoj.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9372abbc---benaxiramusudujuj.pdf
    • http://ressourcengarten.de/azubi/userfiles/files/juwilut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+nail+and+pedicure+salon+near+me
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fa.bin
e4c930b016a2a6d656d08513964d38d88530f0f1756c28e8f93c523238fa2b03
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16296 bytes
font_01_sfnt_off00010eed.bin
1cd5c419385700fd89d36d2b4a289c908c8411d6e4c3d1ed05ac384bc6f8ecf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 17876 bytes
font_02_sfnt_off00013e29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E29 16792 bytes
font_03_sfnt_off00015640.bin
f09d4296d7f69947e700f95691381d40beae118135b6a649c2d1dc8274996dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15640 10828 bytes