Malicious PDF — malware analysis report

Static analysis result for SHA-256 df031eeb50921ff4…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 00:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 692c21d36d38a0bc0844d28fe21c0d52 SHA-1: 0d74400cfe1049432bd0ddf1054ee7df378b1ada SHA-256: df031eeb50921ff434a6feb80d36a273851fdff92ea9d017ae16f0cad6592dff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards a tactic of redirecting users through potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a6aa96e159f631a3de42611c3512f7d1/gerisuvege.pdf In PDF document text
    • http://186086.com/upload/files/kizojasedivizomararipu.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/43281943545.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/jemilusuwonad.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/crgsvlpm4s2kt4bdtj00vbs64t/nukupebepadakipinupa.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/xosojevevaretavigip.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/pobukomu.pdfIn PDF document text
    • http://air-con.ru/upload/files/pugedut.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160870a923dbf2---muxib.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/77161229900.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/91733338506.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de836ef10---26705915046.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608513a082c91---gokodajifum.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/94376082668.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/54761361588.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaac326866---vaninok.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/58657658107.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/bifiwozikuvoled.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/mupilanejipaz.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nevijexe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160859eda57dd3---72401152675.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/mrociflt2agiqi9hrklinbj3ad/43360339247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+wretched+of+the+earth+pdf+downloadPDF 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_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10508 bytes
SHA-256: 70fc48b2beef839507b2c0f5db544ef9df5049dc1e03eca8d490d8850fe0e954
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 17200 bytes
SHA-256: e1b720ec5a469b1f579e7ee2d73a9f5ed83f90eea921b6c6f65ffded0b8ebfc3

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