Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ea1092fd16b6e6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 22:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05d4497a843d0ce55739b8e5d209034b SHA-1: 997f2de5f1654626e4f13b26691286aaa905108b SHA-256: 88ea1092fd16b6e615f2036f59018602f73c28f478db7cef497c4cb79e55a4d0
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to trick users into downloading malware or revealing credentials. The document also contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://nomylo.ru/uplcv?utm_term=webview+play+store PDF link annotation
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/gamufubiravewufenugamovum.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/85420243730.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/81904874546.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fssqcpj9bnqsqfc46mg3ii4r58/romajomez.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/19511227780.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/tewazugijajit.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161432435e6b27---nesafagatigiganevufazotex.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/9516879527.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tebodikarifimawiwamiwu.pdfIn PDF document text
    • https://computerzone.pk/file/gajakozosetefexobisokis.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/tobopepinivoled.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/90069990897.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94238426b---mewuporukalab.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/21006634182.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/42222609424.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/zipetulavusafixugere.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137603fa7fba---10126834476.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/petopomudegegolu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fec0884a4bc169f5fd419414a0157253/44935267413.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/vagepi.pdfIn PDF document text
    • https://comfort8889.com/upload/files/biwozovusoduripefex.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/25606500791.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/88062906225.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zifanol.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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 10540 bytes
SHA-256: c259354dcae215cf543c26b4dc9f6416fb807c56feb3809047a7f1a97f182a0a
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 17408 bytes
SHA-256: 4311204db27794de2abcdae8e4129a9e4d01afaa799cef8c3e14a7238e5b68da

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