Malicious PDF — malware analysis report

Static analysis result for SHA-256 691efb6bb8e41812…

MALICIOUS

PDF

90.3 KB Created: 2021-08-07 10:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6b04277f2c828e35d11f08bde4b2351d SHA-1: 43b140abb97647823bb24063200b562f0427156d SHA-256: 691efb6bb8e418124082c9ec5149acab02438ae9095366dde50539fbd39b7ae6
224 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and credential harvesting. The embedded JavaScript and numerous external URIs pointing to compromised WordPress sites suggest an attempt to redirect the user to malicious content or download further stages. The heuristic 'SE_MFA_LURE' indicates a strong phishing intent, likely to steal session tokens or abuse multi-factor authentication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=forklift+licence+renewal+form+nsw PDF link annotation
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ef8a3931---lazibokan.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/rilagukizezitefud.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/21071001805.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46abe7208---kogewofubudofa.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/levowukemon.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/20174091449.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738f85ac41d---73327568571.pdfIn PDF document text
    • https://ambalatender.com/upload/files/nonojawixolexodip.pdfIn PDF document text
    • http://tencanpowder.com/d/files/doxuxunaburafufepiv.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f149f0166c11cf431e990c39ab443e17/lopet.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/4538474475.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7acacd872---zogomefodapulelade.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/takuzadifak.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d718b0ac4e0a694057a537d94b5c0106/xubokaxeriji.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf55c7cbd6---gokozenomosevifosutas.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/38312130801.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/v76bq50ecf3u7a1og3utdapvt6/49354984787.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/muzerexol.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c76eaabcc1---fivisego.pdfIn PDF document text
    • http://linza-market.ru/upload/files/jalisu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4b8b7f977dc7138f1887496eaca15b60/8314550790.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/fojarujedofavore.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/pesozeberagafewuge.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/durovegetefuvut.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_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 17188 bytes
SHA-256: 6118c89569c4c980a2b39a299d838be18a55f64de51b8f44e4c8f04f7c1a1cd3
font_01_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 10652 bytes
SHA-256: e7355ff74f52798839797aa16fd17a00659c141238c0cf4345ea7d8d0b39517a
font_02_sfnt_off000140c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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