Malicious PDF — malware analysis report

Static analysis result for SHA-256 8363376d57a74a16…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 22:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fea108383581c6dcdd714ffba797f5b3 SHA-1: 207cc69a28cd4348c18c1c704ec37b7df3ce450d SHA-256: 8363376d57a74a167e0400f832bc10a2d45a853bfc8627e7300bedc70a3e4f63
196 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. Crucially, it includes instructions to disable security software, a strong indicator of malicious activity aimed at bypassing defenses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b22a5299d---6975484089.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/05d4062a065e7f1df71168dce32baaea/pusokenugejezagarumora.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3797e09645---72125269840.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a47d4b76---vujanunigebafelixupejuzot.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a91810191---52875024372.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4af6530bf6fbae18fd73fe4cac1c708f/22261629533.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/wujenowo.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202108241704219462.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888b8ea049b---10049022135.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/nupisofekisapawu.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26f01c3fa---jazefijixixabopikilaxuwa.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a090e265df---lovaxu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zekozoxisezobu.pdfIn PDF document text
    • http://contactconfiance.com/files/files/xowetabodi.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/61880123920.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a100c1103f---66963348782.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/zirujilijiderinitujezeb.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f830730be---fevozes.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/19219661379.pdfIn PDF document text
    • http://msiutilities.biz/documents/zivozowu.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/8573347298.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/vomigiwodilumuni.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/13021762033.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a60a0255---bupuvis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adding+2+pdf+files+togetherPDF 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_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 17652 bytes
SHA-256: 9f54a390af490ea16309d1b29468b35b4176e7bfc916e6e52f6e06bf6ce2a26d
font_01_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 10716 bytes
SHA-256: 568198495d2119d84c68c5478ff1551ad63b1d3741d6e60855838c563cec07c5
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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