Malicious PDF — malware analysis report

Static analysis result for SHA-256 df41996bed57e11a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 19:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b14927172e6beb6cf445dd80005b44b SHA-1: d70f9509a42f2df68d786581da3c43c7f8a0c433 SHA-256: df41996bed57e11a0aa4c1888766f1f635bdbf44e691b4060f3a82b38e34db5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting a phishing or redirection attempt. The presence of embedded JavaScript and the link farm strongly indicate an attempt to lure the user into clicking malicious links or executing embedded code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://techscreening.com/userfiles/files/kesumifavewiwekatarisim.pdf In PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/nigipojafovexokuguzef.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/malofibix.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/56793602859.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/98876990792.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/31525422309.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb213eba65---56791009128.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/fewusanenoxofenifi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/32129874898.pdfIn PDF document text
    • http://uchid.com/uploads/file/tafijevosekuxuwivob.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/67806162224.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f21716bee---99195477637.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/79872243722.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/89472365736.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/83560181046.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/74012580598.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/wefawimixezozejukuge.pdfIn PDF document text
    • http://markone-tools.com/upload/files/17210441125.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/dolimepapewodorofulum.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/97435822337.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/romedexojidapobiriloxo.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/91819001669.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161360a65af394---18120154823.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/2368428965.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/xogufamukuwavoduzunasexuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=black+butler+episode+14PDF 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_off0000c219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC219 19592 bytes
SHA-256: fc0f11281ce6d31c6c80e8874300912686151dfc5676b0be079e48f1220331d4
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 10916 bytes
SHA-256: 069e8475844680596e91aee127067d3111fddf4986f83e80477f22010a375edb
font_02_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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