Malicious PDF — malware analysis report

Static analysis result for SHA-256 63733a9a5587a7bc…

MALICIOUS

PDF

88.2 KB Created: 2021-08-04 15:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f59a6e2107575a26a7d3b542e5fc43cd SHA-1: 4f95fc28f54a7cead07fdbe007a294b9a5a113f5 SHA-256: 63733a9a5587a7bc4e260cd424acbe6c92553063287d04253a2056383a1385cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=software+manual+testing+book+pdf PDF link annotation
    • https://erdemlerkoleji.com/resimler/files/71503126488.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ec07b8807---kofuponuruwekizokuzazapan.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24fc1dcb1---52500059010.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/62b9ade7fddfd351ac87d324e15d8435/duxuwit.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde6f214992---78839992387.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/zurazonuwazuf.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e57877e58ab---kifatetumukopimemiladugam.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba85a0d7fa8---38901755971.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mumafu.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/28084814635.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/65300238660.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/bodofowetalimutar.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ab84e1e71dbdc131f109e16b13b54010/15362217009.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04f445a48---rapibanemaduterafus.pdfIn PDF document text
    • http://kme-kme.cz/files/file/11102733110.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/201f5bda40eeb77ed78caee3f61f020b/larem.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/648be08abd58e947ad38b2d65d30e384/sinexoxitupuwojujoso.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/55666098793.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866590069a5---vozozuboperufifojitara.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/zibuzuvaresarovikopolidus.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/44063021682.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/84d08b057ff0b1ad13a9a3e9aca49c89/24037131305.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/gokudobitamobedabosebowi.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/17764305997.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/75305d351a8aa8c34582b6852226156e/11273508626.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/26973042712.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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 11332 bytes
SHA-256: 27ef1c61c0f67bc67c2d7308e66c5cc408890164e8408672afc5956497fc4486
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 17236 bytes
SHA-256: 179a440040a949cabccc9db8c033b85c8dc762ad31354ed3b103fa1cde19c1ad
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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