Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8ce83827448258…

MALICIOUS

PDF

87.5 KB Created: 2021-07-21 22:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5a5e6acc6d4c509f9b3d49754c68531 SHA-1: 741f3c1e49a57842ee5f6b5e65971e8990303a4d SHA-256: dc8ce83827448258f7b8bfb98e68bc66b69508404858c8d69ffaf261af2a4176
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on various websites, many of which appear to be compromised. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://menlopark.com/wysiwygfiles/file/nimafugokorigenafevuduboj.pdf In PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/dixiguko.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210715194946.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d65ec9ae8f4---kuzukajewodo.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nuleduxojudorabex.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4647a2cda9---totumezugot.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/86704861841.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b261290f2b6---rinumupa.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9q39phrh6qjvmto4r3jfvcs53u/kedabarakemajununa.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/72405500232.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/karotenok.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/pobamasotetovo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/didajakana.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/zomozisajevapubudis.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/48148652608.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a10636c2c---pizugimun.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ea61f7f0667f69a10e5f0216057a8e97/rapisetegosunixewelajajot.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/vuzemafemalitefo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wobajukakakefizise.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/uumjhdc54p2dihgfmpbfk2v012/81441624106.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/82867335951.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d953b733874---40305717410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+ps3+emulator+androidPDF 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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 17368 bytes
SHA-256: 640e43a8153f8ed56c3984ba7f4549183d175118446d7eda536687fcdf5024f1
font_01_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 10912 bytes
SHA-256: 4666b4ce525fba066b8ad5cbde68a744345cd72ba3a8218a3b17ea98b6d2977d

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