Malicious PDF — malware analysis report

Static analysis result for SHA-256 5039b840c1967c56…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 23:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7823a1b212f76ec43cb283d219c19df7 SHA-1: 18c815af846968f2d54c0862612c5b849b1fa4c1 SHA-256: 5039b840c1967c564443f49b935c0c155b7a9e50633d34f0191ac1e222277272
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with multiple embedded URLs pointing to potentially compromised CMS upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/05136f87d501c24abc7c4073fc34282a/vulejenilaze.pdf In PDF document text
    • http://wmc21.com/ckupload/files/88078882498.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099352a805cc---73291114980.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/muraregesefa.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/peroriwunuk.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/jaxopevagi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0a64c0f048a9d8e4779aee476891f9b3/pexomoleviv.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0560c29f7---40062837036.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/mipulakomemitanisu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c026a2b6bda---39460254950.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc1e05257---tedaxi.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/mokoxewaxun.pdfIn PDF document text
    • http://cartopack.com/Images/file/824307686.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/80praro8a2pg4dfh0tkau5krss/memoguteku.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/52447014914.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081714592667.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3e2efcf8ff5fe855bc50fd832188363c/jutarodo.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/jobivejanawupimesebum.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/fc499ac7b2d4f1550a478fa9ab3e9b56/deranikigomavabubofoxano.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/vawedotelakejomapalarilez.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1071b3e95---81154178243.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/zofizu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/i22guk2rpq1ka666a84kc1j7t6/gexitajagijabe.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088952721152---xapujolemeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=push+button+switch+idec+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_off0000b65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 10736 bytes
SHA-256: 0e5f017b8da2af7b76c7d2003e6fc96672b607f62fbd1fb9b2679ddb810ea9ab
font_01_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 14584 bytes
SHA-256: 9cbc9d34810809f52237cffb4448a84b3b7651df6de2897c9b2a830ee3a00b69
font_02_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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