Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3bc23614a3e4b6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 09:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 495d8de1b89a414b4b12214d9d5c936d SHA-1: a394e8b8676b24584b86dc01a4726bb61b7cbce3 SHA-256: 6f3bc23614a3e4b6cc1686a4b16b8d4a7e46a10f8e21ba0d3116adeada57d69b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple links to potentially compromised WordPress uploads and disposable hosting further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=house+flipper+unlimited+money+2020 PDF link annotation
    • http://ehoron21.mn/uploads/files/bavufejetajuligejipowatir.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/fekobozi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410ea6ac532---85579665032.pdfIn PDF document text
    • http://kaies.cn/upfiles/210917054159377814ax1cy9.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e7279a6a---pepavolupunamenesorumasap.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/60741149807.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/58916223025.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021916183704676.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/wugilotometuna.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/wavodobuguvepatuba.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/78508912612.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/11441876410.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/77797446384.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/89574229005.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7e9515a622d7239f3d5e15f48c2881fb/12541373865.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/larezigesatigamowi.pdfIn PDF document text
    • http://goref.ru/files/file/wososuwujuwakotigeg.pdfIn PDF document text
    • https://steammining.com/userfiles/file/merozejoduvegaxujeninarer.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/18728446167.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/51579896330.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/58815102790.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/18391834538.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/ludopavotabadobagete.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/23386824814.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/43368573768.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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 17228 bytes
SHA-256: 2a5a3bf5ce9ce15b8b960975329cb49cd88e49e7da5f3431d70cc95d6834b428
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 10944 bytes
SHA-256: f022ea6b5f9db6f60f31f51ce2c1346ef3b40aa7727efdc83b29dd4acccdf70b
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1