Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e1376d968e60e5…

MALICIOUS

PDF

96.0 KB Created: 2021-06-28 19:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 101ac689cce48a129caca8aadfe126c1 SHA-1: cd27431494784aeae8d14d39cb87f6a8d2064549 SHA-256: 99e1376d968e60e59a7a8cbc6914b7df57c2e9c64f71139a6728b15fc6292f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://queure.ru/uplcv?utm_term=rick+and+morty+way+back+home+android
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5be78add3d1c7a742e6173f15ad888d1/82466798357.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/gq2pgsdlgoh303en3jqnsg6if7/21705516328.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609677fc6db41---mevizirurubozofa.pdf
    • https://intrigantka.ru/images/userfiles/file/70608805548.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62ab902633---rajetuwuxefikudume.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/37beec03ce31f91f47f3289cbbe886ca/85236374269.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/72aca32a5352deb8030b7930f62c8835/winudow.pdf
    • https://alzubidi.com/userfiles/files/laxupujikigefofuruxakifo.pdf
    • http://loadcell.vn/Images_upload/files/sipudaloz.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1bb80b07050f8c4102f907a8cb60078d/4754646949.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/495caf893ee5dcb212f8403df6eae741/47778728702.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21a18688f---nimifol.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ba53a27315d41e5505b24addca1eea9e/61020606776.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d625ddc0b8ce863c3ee20a6c62a1f60b/266250626.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85a99225c---roxeli.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/180b7ef1377baca076f91fe21b9adf60/72067932581.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ae5cdc73---seloguwefilezemalazoxeda.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/466148a007254d1ff0dec46eca7467c6/77600121223.pdf
    • http://agiusfuneraldirectors.com/files/file/bofusefigomuzodawusobupu.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607444137989c---vugibakefewe.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/49507536462.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3cbec9f4---kufajofisozedumopepax.pdf
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/22228940681.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775d9e696a7---18373610820.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a162e6ae12---limebabiva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ff.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 16092 bytes
font_01_sfnt_off00010b44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 16792 bytes
font_02_sfnt_off00012356.bin
01fead697cd0d0ccb97703b5571403e680ab42937e271c6aa613249ad7d44ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 20700 bytes
font_03_sfnt_off00015720.bin
175408b361e5f64f78c76ec650caa825905d3b975ed3355144c80180c521cd7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15720 10900 bytes