Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7b5b4849dbd196…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 12:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9d1d134ac3c1da5f57e5f2cd1491693e SHA-1: 96cd17294d9874f2471d61cab72de5445c583f3d SHA-256: 4e7b5b4849dbd196a442198d0d4e5ca6778f66869c2f811529f83d19fd5b3089
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=how+to+draw+a+realistic+boat PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/56686c0ff2ebcff017a3bc0dbb49bd9d/93987955682.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849a622d0ec---vanusevokepelijav.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9e1407583f33906a37afdf794ffa6559/51852255723.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0744715ed---88457355511.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nk3aufm3qsm3a2iskqjlmm9uls/69119704510.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c501826af---34592935081.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/615b33218d9934648a8c1867fbd12076/tirefafutuxa.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2p257d2eonheprqrsrshcamq4/27344782935.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o9819pqqosm6cjiejb4pblu5mm/jawofeniwudebuvov.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/gifegulegepogaremex.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/99606645021.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/19cshrclgmnm4as99k6f7a98fj/kadibetupogurobitedexez.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/27228676069.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/8758414041.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/01115f2eebbd36cbedc19faeb2fbb251/somibulazujawobusenu.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gorizobekikasalaz.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/42092224765.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b546e2cd9c5---gezikulumurovanuwaji.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/29537878001.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4234515257f0bff252ad2a8d0ccd7111/kigonuvabadajo.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/8847658148.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1fb4f4df---jewazenam.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/livapijiraguzere.pdfIn PDF document text
    • 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_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10476 bytes
SHA-256: ec2faadee3cdab024683c163691d16072a972533e91b9966de7e6994f3f7c267
font_01_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 16440 bytes
SHA-256: 8b15ed3d8627be7cfc7ba0d0ba72d781215d16a2e18c86819537a94985ea1942

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