Malicious PDF — malware analysis report

Static analysis result for SHA-256 57375d31f600d7b4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 15:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bda5a55589767cf3c2e05a444df01893 SHA-1: 3ddeabaf2b133e22a41f658e80fa5ed5f9ced219 SHA-256: 57375d31f600d7b49e085eaafb237d4919a3ba607b8442bc6697d4c441acf16e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://unitytradefze.com/ckfinder/userfiles/files/45314130615.pdf In PDF document text
    • https://sukienmiennam.com/userupload/files/pudofufapujiginu.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/34093458193.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bebexepajovomodizum.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/27794450538.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/lejekagakezukekikul.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141626db2a2e---fidofewenozafominipetezaf.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/28936410313.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/57641225723.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/zunulopepibowol.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/62987854185.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/3916617749.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/jigowameporafadajakuvavu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90493797e---dojirir.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/92880700679.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/litev.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/23011890157.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a265475a4---35443855396.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091014501861.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/57377859565.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/56495266197.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/ribidumumozinigujobeve.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/negirefeduki.pdfIn PDF document text
    • http://rc-modeller.se/images/file///gegaxezilijimapirukog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=family+conflict+in+romeo+and+julietPDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 17512 bytes
SHA-256: 8e0075ff39b35256e40e407699881c1549850c675b36fd85ff4a70ee03b4d466
font_01_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 10792 bytes
SHA-256: ca0a69ee6fa7875c1e1317872526e32adba27809781dd58c641938ab3fedeeec
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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