Malicious PDF — malware analysis report

Static analysis result for SHA-256 3303b2cc6d5a90ac…

MALICIOUS

PDF

120.4 KB Created: 2021-10-06 03:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0397f90d204e39405e54061e2c1f9e2 SHA-1: 8b9246b08d4a0f683fdd450753aa234d18b2f53d SHA-256: 3303b2cc6d5a90ac42313a6e47ea0a7e8edcc7c5544e4b9bb2a7d5eca021d258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://ulv-fogger.ru/d/files/difunib.pdf In PDF document text
    • https://galerie-louise.be/userfiles/files/24254415466.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2416dd9ce1295fd67e9cb67ead5c1bd4/40279166359.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/45644556087.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091820143673499.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/91988061733.pdfIn PDF document text
    • https://sanagustin.cl/files/11700147245.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210904_0D9FCBEE89A03888.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/jumubavoridugafa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vajadebukaxo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/15ce912c3a966cf17b8502dfbe8309f7/niwin.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/riwukuvaliziwive.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/forilamexepodumixofa.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/4168511920.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/43065066185.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/nebunelowo.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/ladalupinonuxovinalum.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/48511836568.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/sabuxa.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/91560634502.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/39842908008.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/18804000190.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1649ecbc---sesenufupilutejenuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sister+act+the+musical+script+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_off000173e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E5 10836 bytes
SHA-256: be0824be657627f3c5c7d592807d998c5a9b92beff8daaa5a0e5c3c689fd40e7
font_01_sfnt_off00018ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F2 18528 bytes
SHA-256: cd11503048e63350c9f8886960a2a9e06ed0b0be266204846014badd5b117b37

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