Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ed4e8da5234a36…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 05:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab90cf67dd40d043bea278715ffc5fa9 SHA-1: 7b5da7ef00706b7219d1a52f93f35d73dbfe11d4 SHA-256: f2ed4e8da5234a36c4d7c3d6425d69c6d22538c3307b2fc32dcb7f8992535155
164 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and presents a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bycongroup.com/UserFiles/file/dejikitivano.pdf In PDF document text
    • https://bursakaynak.net/userfiles/file/xakijuvu.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/posn3sqibno4sechn5l8vp1ab2/71505921510.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/61508799674.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/fideboxupusafijotepid.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/lexomoranosoketavixeroz.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea302d97d3---tamuvonipeletoxaduzub.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c620b09ea---20318878491.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6abd78a69---29421027118.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f94c8ddb---fojipimerididevin.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f718a92aaf---dafodu.pdfIn PDF document text
    • http://jawarakreasi.com/file/fususon.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/25d4189c1146bdab7797ef4814956e2e/peberetorir.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613248c13756d---30913935212.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/jamuvabijove.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93c268cbf---42531867220.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf758b6ed---goxomokanixe.pdfIn PDF document text
    • http://elpijisystem.com/file/kijixorutukakarobakulu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/rumagomobotanuxumeket.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/dudodevosux.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/nixunadop.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d45da3017---zixaloder.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81965393622.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210906051336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=eppendorf+repeater+e3+user+manualPDF 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_off0000c673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 18204 bytes
SHA-256: c51ea65dd3383c455c7301cb3732cc511d41d59073f3d10e21f4cb506fda8bb7
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10820 bytes
SHA-256: ee8a807aa48c345030ac13c794ee24d6bc9f7dbf4bbe00185a25b3973da6a2f4
font_02_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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