Malicious PDF — malware analysis report

Static analysis result for SHA-256 043ac46217fb9e07…

MALICIOUS

PDF

101.8 KB Created: 2021-06-28 20:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 916d88eaa215e82790c48f0adb5f7b96 SHA-1: 6a167543e5fb10cf94c996041ce5c47e543d79a8 SHA-256: 043ac46217fb9e07512708c827b5c35df9c1ac59b8eee6661e93ff91d63f9e30
164 Risk Score

Malware Insights

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/e86da20b1a69e10e699ad1d1d33cf158/46382834442.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d7c40ee9---rogebifokavexugarotemux.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8m5jqjd1npbgkqb65ff2mj5g0/dipiz.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/75427768309.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f45ec41c---wuluwufiwuxavumufuseba.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb102b413b1---kipowupadexafo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f7671f2a99b05b041d66cbc2cfe84ed6/firunivajejaxebibapew.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/29062333202.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc32fe8679d---20416979841.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/df28ba1f60acc3099447365f94095a99/kanatubojamepiwuva.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vipedod.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/4785705094.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2572bd409e5230a32a7c52352c6655e1/nufaxod.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086323324a12---sogemibiwijatujawoliga.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b1c1c6a5edd5486e887fb3669a59b237/2325001690.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac8d3bd33---dolezogijomoz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef18a2efc2---fizofetokumivumisesepuno.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4f1cdf2afce2305ab6bf5e6272affd13/50245880920.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/08e9b7ea5de852bdf09a51b50ae938ff/guvijogafuvixavog.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b53ef49d24cfd16ea0e9f4d95dad2d0c/93901820824.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2c3524d9dc41d89368b40270dc982b49/tekobeladutixufesodefozaw.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a85fcd794---28466718776.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f362e3a72e---33477456774.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/85103542575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=puzzle+page+picture+cross+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 2752 bytes
SHA-256: 5002b73d1e7ed86861f0445e4c512d2a1a34980960353de9eb185942b20695b3
font_01_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 17812 bytes
SHA-256: f7b0efb0dad28bf4c38d1399a41266347888e8292d1a0cd3d93cf63f7a5d7b4d
font_03_sfnt_off00016fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFF 10796 bytes
SHA-256: cf1c9d125437182faa6d2ae05e1ec5aecef1baf483e8866f2ec85f41792c0da5

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