Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d532ea1da9ada13…

MALICIOUS

PDF

77.8 KB Created: 2021-09-21 23:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a4c90adaade4e486736534f0d51eadd SHA-1: a56c54fe12d5ebfec7c7c27202889931c47815ce SHA-256: 6d532ea1da9ada1324de2d015bf8cf5fde01b508048dae90048dc480c3e76d8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://weeb.nu/userfiles/file/43910894380.pdf In PDF document text
    • http://inimtrento.it/userfiles/files/83705498958.pdfIn PDF document text
    • https://kvzriu.org/images/file/gexuzezadewulatedenuju.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/25732254683.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/35549439376.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/barakasegeredovopoxexiran.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7c0771856042478e5c43468d09774642/lurefafajufoz.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c9585bdc9f9ad2a6715fe35b578195e5/ribopugivilirodibugugifak.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/13071076250.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/89434613181.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/14558392506.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0ff310765---nokase.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/51406574034.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840b1335f7---menebelezusitig.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/965424137.pdfIn PDF document text
    • http://rinsacars.com/files/others/68560225851.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/91750934072.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf13c9d81---vuxakofuv.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/wuret.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b1a0ce66---11575591166.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/62478581275.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/28597513035.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/pofodiveduwiwufukesemapa.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/23797106769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=anime+live+wallpaper+pro+apkPDF 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_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 17984 bytes
SHA-256: bbf081769f8df9201ee0152c9fbe26126340110517f2a7d7faff86e57c1754d5
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 10372 bytes
SHA-256: 0186c1929d12b2f2a185961851d5cb468296ee8ddc3bff83142d3324e9db6e52

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