Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f73d6685a711e97…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 21:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32708fc9e7b4e2c46dfe746405d83f46 SHA-1: 4139ab0b862f6dd814d8f6b44527a5fca73b8fe6 SHA-256: 4f73d6685a711e9764521835aa6c99a562e5e66d1d28b925f9eb5e764814e86f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to host and distribute a malicious payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a malicious link farm designed to trick users into downloading further malware. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://zeminyerkaplama.com/upload/ckfinder/files/funizefenoz.pdf In PDF document text
    • https://maychieuvinh.vn/upload/files/dadukodokakek.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/jasilagute.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/36111214236.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/92088707316.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/1165131653.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613137b257f69---gesebi.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/janala.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/95937622254.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/jepuj.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/dinapevofilofesolalo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/unendehlbtoahh9h4qimnnpda0/xomakodip.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/nopezolupefujuk.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/89713fb12607891c9b5a8773434ba98e.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/dosolufaj.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/8432327305.pdfIn PDF document text
    • http://raczcsalad.hu/files/siwibinelafekasuzuli.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/32727387613.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656ff0a439---gavasijadavukunekod.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/15228551388.pdfIn PDF document text
    • https://atrax.hr/files/81757643243.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vopamibakedijajazen.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/58686554023.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/lifezotoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rrb+alp+cbt+2+electrician+syllabus+pdfPDF 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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 17504 bytes
SHA-256: 06d548ef9527d30f6fe15c4980bc404843b9a33f680785d67b2feaa811081c85
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 11012 bytes
SHA-256: b832c1040be2ba66ba87ff954ee96b67b8576463fd2d67bf8f5a6a909e10ca1e
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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