Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41f57a8b52a5baa…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 13:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 994355c99d6a090ea27efd009ac6325d SHA-1: 1b5c88bf1e2df583beb9f6c70b2af0ccf2b1016f SHA-256: f41f57a8b52a5baa6a236be3902ba664b5e5f49a5cd8c7548f329ebcf27fd166
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, with many URLs pointing to various domains, including compromised WordPress upload storage. This suggests an attempt to distribute malicious content or phish for credentials by directing users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://malashealthcare.com/userfiles/files/sinujobimebezofelekiter.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfe7f1625---62156854033.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/36013464360.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/88160616299.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/medusovafotikag.pdfIn PDF document text
    • https://polaria.cz/images/file/fotujuxerexamazonupolidis.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/18429907396.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/bamemiw.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/29087238013.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/wiberodarexob.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/gomofozokakuzo.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/17573282247.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/58150656936.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/gifezosubunuzi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bbe711673---52630603686.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/jadulariw.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/goronem.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/najozujinazudibisabe.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/78533198351.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/javavojigu.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/43310314008.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7c9f685---puzuzofonoxeto.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/feloduzapisolutawub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=doctor+who+the+day+of+the+doctorPDF 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_off0000b237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 10364 bytes
SHA-256: ac846458797ed5fd313b8501755badef64913267dd91189e09a39e4dae9c72eb
font_01_sfnt_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 15892 bytes
SHA-256: d8cd61c25591f8c66548ea952da53710b8328f89403fda1f70eeee12e91c8564
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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