Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16dd65dc686a61c…

MALICIOUS

PDF

91.9 KB Created: 2021-07-03 08:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a263a082a7baec4d183ae317001f0e5 SHA-1: 7171500f5d03f1d658cb588b40d79e1bbf2c7759 SHA-256: d16dd65dc686a61c6aa2483db44b5efbe664adae4932e5e974a3d52636a9ecb4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple unknown URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and numerous links suggest it's designed to lure users to external sites for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/0j0b3b4b4jp551839rc7ajb4h1/26061730112.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dce99a64---kiwafi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21f626a35---rizikezulafo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tajobopavotidefiros.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/urspcbtbq78fpuud0748u875gt/bezizotapenima.pdfIn PDF document text
    • https://capecoralliving.com/media/file/pezujebi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cuoefrqc53d1p51844u3jgink2/doratuv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mi8n59visvkto1aq7uine0vef4/93778527723.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512052700319719.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b07b23a6---gunotepepitutili.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/punidoxowo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e6831d5d5f006b52493b774d5f5f39a3/rezotulipebiradosepasetuz.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/71620509811.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2d721566---vojavirutiwakopuzijiduti.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/751kpekhk0qjnl97808pi0g0j3/waxitedasorut.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ac54b257e690b2e4531400084803d460/51771475169.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/xepalepapised.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc299274b---ruzoniniju.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/3031021227.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3180792351---xuwekonezatupo.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/xarotakizurorigaratotex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=benefits+of+water+fasting+for+a+weekPDF 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_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 17408 bytes
SHA-256: 2504b2083710a9239d5bf655624b77645a82ae63f44d41b97588014669e24170
font_01_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 10572 bytes
SHA-256: c7b9040ff3fa1c13a551bcda751d086a1bef8b31a1e16d84e1671a179e4bea32

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