Malicious PDF — malware analysis report

Static analysis result for SHA-256 550c0d0ca0d1c0bb…

MALICIOUS

PDF

85.4 KB Created: 2021-07-09 14:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 551b20475d30552a82f907338e341b44 SHA-1: b8d3a3b3290278160688934797a02868e4ad8476 SHA-256: 550c0d0ca0d1c0bb3656f84502950e94561cb7783b5c737f028c31931db96e5e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host malicious content or redirect users to phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute malicious links widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=might+be+able
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e4d69f2e0---supuv.pdf
    • http://ascensionchina.com/userfiles/file/10343724453.pdf
    • http://vce34.ru/attachments/file/83863656016.pdf
    • https://avvocatoboretti.it/file/12311859626.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/fixumafefamedubunulage.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2796f906a4---37657123922.pdf
    • http://mjacz.cz/soubory/files/57829782054.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a8f1de83900374bff19dd66b4a6786ed/5578677652.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb4555c1c---10705370252.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2b1d4bea---xunatenelipefeval.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/70f239cb9468298d3f37f54460367850/midowewefogobegamutuzoni.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3b7802b4bafd32a05c7cd254298faf3b/22263931858.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/m0t056us6fghic621q1n558kdc/lawulatoxedewopulapodi.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/m9mpocqe86ce05j5aatebelj98/8512459890.pdf
    • http://archerelectricsupply.com/userfiles/file/90384127010.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/73a14d306ef9b2692679b17c86f6269b/2366716465.pdf
    • http://tajeer.co/userfiles/file/57485429413.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f3206ea8---birerareveriv.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasawigitojufufise.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/17798015581.pdf
    • http://www.aadhar-interior.com/userfiles/file/32916527797.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1n6evecivo6plkac7mikdeap38/muzuniriwavanavolapunub.pdf
    • http://citysuji.com/ckfinder/userfiles/files/voduxazu.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1886837ac27b361c7686560129eadccb/66159460827.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e2.bin
c01e606cf71ec59ab0e83d38fa83f132467d4120050e1f84d480a5e730e3a56e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 10028 bytes
font_01_sfnt_off0000f73e.bin
c52540bba78e84481eb10e166477f812ec507f2f0196dfc4ba23a00552fa8a93
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 22760 bytes
font_02_sfnt_off00012e9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 16792 bytes