Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f694ab9eabe3a0…

MALICIOUS

PDF

79.2 KB Created: 2021-07-06 14:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 95d988fc1789a0785a148c4a055431ff SHA-1: 732d531370206c6ecf8b708c2a9b068329fcf2d1 SHA-256: 99f694ab9eabe3a0583d74807327f95ff4f68852670d964e158ebf7322413fca
236 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It presents a fake CAPTCHA to the user, a common lure for credential phishing or to trick users into executing further malicious content. Several URLs were extracted, many pointing to potentially compromised web hosting or disposable domains, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=150+rose+hill+road.
  • 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 http://dagmar-e.de/userfiles/file/60946350701.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2517da4bb8---60330453042.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/83351334775.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982a6569a6b---41587900871.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/pesekupuropaselovexewejas.pdfIn PDF document text
    • https://andana.us/files/files/gotipaxomepu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/10108257050.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-5/20210605051111613442.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rlfliknd345ptk02oi3kn6ln44/89501489510.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089eaebb49d9---nuduwigogunotudibalos.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b792ad89339---livakaxulewuwumakepij.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79a99e86a---rolukevodokakaxat.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cacc2d8191---zufujidolo.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/83982162365.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/xefuvukozu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6f897fd2---sefalivonevulige.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c057fadd7e1f314075f4c5aab49bbcea/kizuwawigasitef.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/78028691160.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6j5njknl9kt0dkvjruhtkl3tr9/wufuvodaw.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nokofimikajepovo.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/934d2baff42cff362c5f3fdda017b8b4/vopidixisevodakawumewovu.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/94668193130.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817300cd3b0---48006775162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=150+rose+hill+roadPDF 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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 10356 bytes
SHA-256: dd16c3955d1f175d8571e54b78146274d811587278cf5231be254f01499f104c
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 17756 bytes
SHA-256: 92699b41578a011c9c0bb5d28c2f2682fc8efa98704fba7d8e1cfe772ee8c3cf
font_02_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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