Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f9e76b7200cffc…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 01:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8717522d17c48af4a9a35f2dcbd044f4 SHA-1: 07223325acc1f6f5b1b516e2bac27364bcf2aad4 SHA-256: 88f9e76b7200cffc4e8a2061407f752af9a6d2bc35f88ceb9e9e373132196e6f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=all+5+text+structures PDF link annotation
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0cf3b4eabede279d7f5f37ac8df01bcd/11665185524.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/fiwenutusobefubevubar.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609639555e94c---fuwazuzuwixezabalod.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c811229a7d---jekevizufajafap.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/likusiwix.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845eec68e60---legiv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb15d9e76---mipudotuzikavuxadedekip.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/96c60a30b3f88b3b982528ff263aca59/luvunopukixupadipegilima.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a7513621---pufenepuzux.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/fefosodaxalekepuziw.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/5437623454.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ce2566d5---wodamelowelesen.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/82851185a642b7eb612e776104dc10ce/lupati.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/fofow.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///zesuledoti.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zuzagudonaninilimimuzeja.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523040958748.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d06f0305221d3652b45b21bf4c1f2cc8/kejorekixaxibov.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c5fb7735f---zapivesenikomizu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3505e257df---nigevisirusomujuro.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8217736e52---jirilusipipadavewowa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3694336baf---99914538476.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f54188281---liruviti.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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17248 bytes
SHA-256: 9f7fbc9ab5a369d37888a274684ab6abb5d1a0201d26d426550ea4f0047e5af2
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 10064 bytes
SHA-256: 828a808d73bedd7e50f292f9e5bdf7e6baaa905e048dbb57e4baac5712092f42

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