Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ccd81be955f94b…

MALICIOUS

PDF

116.3 KB Created: 2021-09-07 18:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecd74620e7a6c33d4aab048d0870677f SHA-1: 404422a090c4e28020f026a27f1491c124dbc0b1 SHA-256: 79ccd81be955f94bc2dc9a0d47e296edd2b4379dc9e1b3390eaf7d0cda31b47e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=thevaram+book+pdf PDF link annotation
    • http://local-minicab.com/survey/userfiles/files/negaf.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/69428678501.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nhi2nq2k5tesc7cbp2binb9bth/bajegeramedaxedekan.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f805ea98d3f---65400453134.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/tudotemomugarenokuxadera.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/texagelugudifevufijuta.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/somifafixil.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/79144411532.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/42332278634.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e644e429---99165296510.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5707f209e---vogen.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062904562778642.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bba6a6c29eb---17554810798.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/vatibenalinubu.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/43444309968.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/bojuluxisuvitezepisekiru.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0daaf91f2de256f003a62fb7b2e6bd82/5395005575.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/87408957692.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/97322213872.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/1707084069.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f1f761fe0f0c44326d5efe793be73a37/79016432503.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2020e87512ec9985521451206bd65ee0/36116265581.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_off000159ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EE 22376 bytes
SHA-256: 4de5649974f8bd4c766d5c4b8fd29340dc1c216cdc198b55ad3f0adeb14010ea
font_01_sfnt_off000193eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ac02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC02 10516 bytes
SHA-256: 0befb4d202f66dc1b129a716f1cd6ee8d7aaf7c5f7b5ff580c760f2bc417b34b

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