Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbea807d7d309a2…

MALICIOUS

PDF

84.4 KB Created: 2021-08-25 05:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fac88823f315b70705a4a36c7f51905f SHA-1: 592c6b4c3fefe77b6e4dd5985dfd5a4acbe6b275 SHA-256: 8dbea807d7d309a2b42a361ad251df254536c927fd4e4f2b7147ad83f39c243d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://krisoc.ru/uplcv?utm_term=speaking+dell+hymes PDF link annotation
    • http://autoneza.cz/UserFiles/File/60178449521.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gowarutozovimapefes.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/ganipenagazukudefotug.pdfIn PDF document text
    • https://avela.md/userfiles/file/74474165004.pdfIn PDF document text
    • http://chromavials.com/d/files/37203540925.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3640b8eff---nizedenafakibojesesik.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210719_8756A9258318F86D.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/59587620516.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/50bbadf7609afbe9259f36f06010985c/gidapotazu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210523174823.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/eff07755c905a9ef9ed58328c2a1bbf9/wekimusitijegofisizuzuv.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/7b545c63553f42b35f4b20b4091fc058/pabolivolefusazolod.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eae07c1ac---49369444426.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/4f2edbfc3bdd0ad39a356b3820f9939f/kavuwubisosukewaropaxoki.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/visobuva.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/tulusasamivoj.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160860f48ae85d---15263506040.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/59110963792.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/f72casvjd67c7ul29pd636npf6/nozijebikem.pdfIn PDF document text
    • https://izometal.net/mm/file/xebogovesufopuju.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/bawapugetowazivelo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3k0f9gvojehnh1f1mf0m2pfgrt/62165147640.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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16552 bytes
SHA-256: 55b2d6045da615e25ac93d8dc8db136e1750cfba7089834356090b045863edf1
font_01_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 10804 bytes
SHA-256: 59fc626efc67e1987d843af97795c42ae2140629083f5cf7b84ccb636e9303ec
font_02_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.