Malicious PDF — malware analysis report

Static analysis result for SHA-256 33029caa10ebd0a9…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 01:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b0f86263f3272d708aa40ddab6cbb1fb SHA-1: 08d77a42464e8557663a5034d92e68d063500eb5 SHA-256: 33029caa10ebd0a9747c39c60c9606a86c70342f8ae1d6eeb79f5660aabd220f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jezuvotefipukojik.pdf In PDF document text
    • https://syteq-pro.com/userfiles/file/tatelixi.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/tulixemibanakuno.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/53175774944.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/63e496f1a1c5151a024e2165a2eeba23/pufufo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bce08b48---31477550674.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9001fc40d1282d507ec99f26b958db37/dapijeju.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/46108711007.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/7s9p6oq8sre3f1dch5cb9df58b/17841164348.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9bc5ad57---99093239145.pdfIn PDF document text
    • http://splogservice.ru/content/file/watokav.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700d20e7d1e---24121559195.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5f878d1dd07d8b00c2ef8bde60df6da8/93636798099.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611232216002.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/24430087943.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621704370.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/46938781274.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/92644148256.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608089baafdc2---14276207102.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7830a33ff---dazifemujemewep.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/darujaredofoduzusufi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ba47294e---figuvuked.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4a195405---zanogifanitusoveto.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf03deee115---guvugomi.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/45869614110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=karl+rove+todayPDF 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_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 17796 bytes
SHA-256: 1139502fee4e5211619f9e618164a174e7c08012863d8dc04af0c989d792d84c
font_02_sfnt_off000141e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 10048 bytes
SHA-256: debfe34d6b7a78c3ae8c8f52a9af4d91c8162753fe60f9c01b16745f70cb7b79

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