Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0f964a07f0384f…

MALICIOUS

PDF

97.4 KB Created: 2021-08-23 10:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59ec2af680b7e7af73c9819ebc978d73 SHA-1: b74d0785801fc3c22660d5c719f357ba4d80ce45 SHA-256: 8a0f964a07f0384fb1829ab7b573adaa1ea640f119fc6c24a700e6fe60149b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=mammals+of+southern+africa+pdf PDF link annotation
    • http://dlevitin.ru/fck_editor_files/files/29082012323.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607222b76f2f3---vorafati.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c65c2f7dd---zonoxarilojabesa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/45cac580724cd2015d0e190dcae2b3cf/tajuz.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/gonitu.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/petuvitobomebikul.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/fiwigitugidobarewifanuxo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6dcf247f7---timekupilizulujinobi.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210802_6DE1622F51A95642.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/k2ssdaclhsa63ibfnv7kdki0ko/23002958473.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e18d9b73---berinesuvubaxiwemesuwim.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210703215000118.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mobevajazidadatos.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jv09e8famdfhi9oogusmh295eb/87074607161.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f23ca6bb4c166cd10e63330a1672999a/52447952875.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/sobipedijokonemeteg.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07af5eb487---fexativoguxek.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2892729534.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/nezekujemilisumidu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee9d713b67---roragemuzuxugevexutiti.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0522c66cad88b2d4e0aa19d1287c88cd/pabaval.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mejaluso.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/55403621162.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/subafiputazadewezaxubaves.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/liniv.pdfIn PDF document text
    • http://iwort.de/userfiles/file/xodoveke.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_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 10976 bytes
SHA-256: 49ed4466ab8ae3e875c0202b8c9f0e10a9352d4af0c5b7feffaf64d588779ac9
font_02_sfnt_off000149c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C6 17236 bytes
SHA-256: 22453d35f64dd365d62a6d9d37fe9dba103afd68f03ee27d7564725306e16d46

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