Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed95926251249f4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 16:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94de405a4a18798bcefb71d9ed727446 SHA-1: c30778943953996c408da109e628ef7ddbbcc006 SHA-256: 9ed95926251249f440500fb613a0e1c64ab5be60ab067010ed47bb355a993654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://logtech.cz/foto/Image/file/xifezeperisenimijidogelam.pdf In PDF document text
    • http://purel-biopharm.com/upload/files/55350812652.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/jozexigapakesekalizugevop.pdfIn PDF document text
    • https://eslms.com/userfiles/file/23751222811.pdfIn PDF document text
    • http://schokofontaenen.de/idata/80126175566.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b42812c0cc4d19965e3dffb2b88ac37a/71202801304.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/emndbh91a3eoicrnt1t2s6vd59/piwilevumizowevixuta.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357c6786d3e---rodusufamomos.pdfIn PDF document text
    • http://medica-brno.com/files/xutemufujat.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/90841837542.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/baliku.pdfIn PDF document text
    • https://trexanh.net/upload/files/47037271318.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/ravubev.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210906105248_r9jumi.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/28955705824.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/zakuredizu.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/welewew.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/72825615366.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/vukiganopasogifotapogi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/tubirupisaranosovidi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e3776650---44235855664.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16133d042bff00---zufit.pdfIn PDF document text
    • http://e-hematologica.com/users/file/lakudab.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/58176105148.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/vigikedufuvejibeguma.pdfIn PDF document text
    • http://web5gstore.com/Files/files/wofatomezosevaziwuvovav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=workbench+book+scott+landis+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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 17780 bytes
SHA-256: 87bad3f4a24a5621ac114a4616201cc989a1460178575a18436fa3107a1bb6a3
font_02_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 10940 bytes
SHA-256: 97ade6807e4b7a94083b9f18adf8a85b4f15c10c6d1995cbc5cb1b33623d1119