Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3654f67e76ae3cd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 16:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bac5276f82b207e098313a6d9ef3710 SHA-1: 3e6e5e37cfbc9326b14456f6effd362dd30bf30a SHA-256: e3654f67e76ae3cd10c898787376209a7696c7061026979528404abefc7d0676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=adsl+router+configuration+pdf PDF link annotation
    • http://akekaluck.com/ckfinder/userfiles/files/pozobijizapilokijer.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/f3689f0cbc5f0ccbfb13e2d106fcc175/77837347079.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2728e3a0079cec3702ac8481e418474b/dibinugikopotulijikibise.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/99459260196.pdfIn PDF document text
    • https://actorconseil.com/files/file/63352975295.pdfIn PDF document text
    • http://ccadl.com/files/20210823182036.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/44854486877.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/89e8f7a0f66a624f30aefa176e0eafc1/26206366789.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93d2c7443---87223076909.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a068ab973c8e0a4cdcf5e40e5fc9110/75317095036.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607be92b88298---mabej.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/63236585065.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/3875840571.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/3899486996.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/uklrp8kr1sqbjedl0et0k8hk3h/32073802335.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0fji3hv8rovdldrqtphtm17nm7/12639727491.pdfIn PDF document text
    • https://deepex.hu/hirek/files/77396082331.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/98253026173.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a52rju2j75h5qu43schkrf17b2/87140935158.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3603d1c3b---52410044432.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/14135131858.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/butobasajama.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/xafolukedobodupuwatej.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ee27e8e48e2f9623214f74ae30ee392/57954538889.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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 17764 bytes
SHA-256: 2f64286e0a51e084ad978f1557b29766e282488392993d4ab8e1aa242e2aa93f
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10876 bytes
SHA-256: 6bdff92b4d12dd4d524589b6da2cf4cfea03795bad9f94fe073b56d80e152fc8
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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