Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafa559d44ea4adc…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 09:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83e24a61d0af81055bccf913e3676d60 SHA-1: 3e469acac6a7a5e4d6da1e650b34dc27183aa36f SHA-256: eafa559d44ea4adc112e8dcb0607a0a1c5b9ad7159c4c17e7ee304033bd29231
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to exploit users through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://anna-bel.com/app/webroot/files/userfiles/files/30990748130.pdf In PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/xomewosogofuwesusamixed.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7c84128454624753cd04dd45009c2883/86665067983.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ptpk0d75fjfedsppiub4qf58e0/xosajorom.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/sebixojegoni.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/22375f020fc268143c59d3c12af5cb5e/22447561885.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/rujirotobefonoret.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mapenaxexomugavi.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/redizedizogumam.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a0b80cdd65f1fbc92814e888c5768852/72706507033.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf612880b---64724560448.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf06d2987---25275109032.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae6f6b837---3500883987.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5332fe65e07bcb0523273a7fd4af40b7/kebokezawumimeluzel.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/reper.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zalekes.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hijf9dccis33a7dv2euitv85a7/83332640905.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/dizozubobeluralinimisumo.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/42488719355.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/1a7a4cc6d903b061100e4c8f9f8715a7/rebotisi.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/9044103492.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/futemenuvuxib.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/caacf2f1a59348ef2f1cf9355b52381b/34517530886.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095f002f03e5---3139560706.pdfIn PDF document text
    • https://m3csrl.com/file/kewigenuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jurassic+theme+song+pianoPDF 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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 16328 bytes
SHA-256: 5a1e6806b30673e6d7d55d33e089af6bb83694701b60b025bd855c02b2dd9391
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 10864 bytes
SHA-256: 818567470bd51fc31f423616108474186cb000b3bece0941d0025648f3540db6
font_02_sfnt_off00012ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1