Malicious PDF — malware analysis report

Static analysis result for SHA-256 2027f2b8911c03f4…

MALICIOUS

PDF

73.9 KB Created: 2021-08-30 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cae84e80a4c955e91d6f457c9715a2a9 SHA-1: 9590eedb86fc3c5791debc43fb77e721997fdf93 SHA-256: 2027f2b8911c03f4d971c410dd2e1e3d000c76b8849daae46d6921b2bcbfb1e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://irlanc.ru/uplcv?utm_term=the+meaning+of+constant PDF link annotation
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/7vktijrj7t4q56mgv9deo3v3u2/52720086913.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4940e82fb---43092998638.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f133115de6---52474421684.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc6c755ae---26986148689.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/pufalilibawapukowomete.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kukawedevatat.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1c26b95ede2fe909ded835f6494bef61/30762290541.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/32245089737.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/budafakigakuni.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/lagovosovig.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c92cc1e61---ranibog.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/nexibis.pdfIn PDF document text
    • http://saaretravel.ee/images/file/guledefi.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/d10bc3d1ae46b32245c30c7e1d34d38b/tizugagugopaxok.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/2028325991.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/21342144378.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/tokusaborem.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3a4bbf2a---roreg.pdfIn PDF document text
    • http://asfalon.com/__files/file/99403658871.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/97137278342.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/94877363295.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/kusutataninopel.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///sibogibelovefopufex.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/sugazojixinozajezavu.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/81389995140.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gd5m35si37f5gf0891nps81duk/josopapakawese.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/74694502198.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_off0000bef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF7 10600 bytes
SHA-256: 29605c52ad9ea6c0736721d167ed854eb6f697c73298e532e96f8f589a031ebe
font_01_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 16804 bytes
SHA-256: af1b336d50c6d14fb3e8c9441ce3c93e2606c18fc5de1f99141254a034ced0bd
font_02_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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