Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fe7b2f97992784…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 01:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 95dfb28356a778692757b29550e45a79 SHA-1: 6774e3a524606d885fa6cc9b902f3f84140eeb71 SHA-256: 38fe7b2f9799278478a7d9497105b93df254c95279f26213728352f1620a8f80
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, many of which host further PDF files. This pattern is commonly used for phishing or distributing second-stage malware. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/35699bd198d368896f49bb31f19a9812/8286655475.pdf In PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ee29a3003bebb2f9c2a439bb2adf3e25/dovumixu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/55f8b08f5f05bb68bfc2877f210f660b/56710068443.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/pifenisufa.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/052a3b1d039cfc4675d9df14c16ccae2/powiwasejifiv.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7519a967e7---mawosamirizaparowunu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/tegigojinita.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9814f30b9a---39905277708.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/biratuserademinigizokubep.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nuvosulukojakerajapod.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/duxomosejexefajokos.pdfIn PDF document text
    • http://101doctor.com/uploads/ckfiles/files/60b482fd95b38.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/nezegisopa.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/bomunuwuk.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/bosevotamelevot.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896128ec82c---didezaresivekiginel.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/96c96e98c683af9d486f3d9e3d2afaee/31346034048.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/28768693442.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4244a8a93---tamasag.pdfIn PDF document text
    • https://soechi.id/userfiles/file/25146030702.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/72996334044.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d057e0ec4fc---bakitogukidunusuko.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/fedikaratifotiku.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/92879984909.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/luxuvulemaxubepokogamumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=burnt+roof+of+mouth+blisterPDF 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_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 16308 bytes
SHA-256: c2467e313d0845a06f13fcbdfd029018b6b6b3cc1116cf54509762896ead1855
font_02_sfnt_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 10612 bytes
SHA-256: 05c13aeb7a379e24123dc9ebe1fc270ab7c124e8343c2952fd3f620d4cf3172e