Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a30dfcf80bb715…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 22:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e9f5d637ca508400d0bd00c1980a3530 SHA-1: 7c8f58cff90b5d0a35265a18db7d2299ec5d03eb SHA-256: a3a30dfcf80bb7155113f30759df41adadb37807b9af15c05160c971c64c120f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common technique for distributing malware or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c35c78f5---86390261047.pdf In PDF document text
    • http://americansemitruckparts.com/d/files/ditovazawuga.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0f26c3354f0cd203b41ccf0fa2b81e63/83058141961.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e69a9dff7---mevezobixif.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/nopitewe.pdfIn PDF document text
    • https://telenovella-bg.com/files/guxujezuxisadok.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/17a56c9e8b150714299ad0d169d40b01/wudopivezetikofejuvuj.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071169e31ea1---ninufajijib.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/sisuguzuvifipebe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/d2g81np9guuvbn762vog29j6p6/83350333334.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56a4cb3c7---puzonejirinobot.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/vijuzuwazaru.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c4411c694ea88e0370c4c94551be75af/tagegugoto.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/043harej38cesi3sjsk4ip2hep/18871809348.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714fbbc06f8---ruweziv.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a19d39c7e17e72c6e150fd7da9543e2f/29754115233.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/31441899059.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/japakizazipememasurun.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f9c80444---20439940945.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d4gngu6efui2fne3alssv62qd5/11337426205.pdfIn PDF document text
    • https://jobtiara.com/files/files/3556583110.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f97c73e02---92450396731.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/49123259476.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/50006741305.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f333a9ea---fipituvofizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+work+with+cheat+enginePDF 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_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 17752 bytes
SHA-256: 2fb4a7734e2132f0569aac278f2ac66e810dc88c1ee23cf754db89637cd4820d
font_01_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 10464 bytes
SHA-256: b80652fc13edd406e8e4b138044b9d4ccd75e4e6dd2904e6ca83db499f665332
font_02_sfnt_off0001467f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1