Malicious PDF — malware analysis report

Static analysis result for SHA-256 3104f25db8814aab…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 21:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47e314182383ce0b794cf96d41bfe509 SHA-1: d329de50266ad8b5b7a65855c8a950dd07f46794 SHA-256: 3104f25db8814aabea7df646b0b4fc0f04e2523ff948e43943c801bcb0cbebed
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://burfel.ru/upfiles/files/1798562817.pdf In PDF document text
    • http://skybuildinfraprojects.com/uploads/pejifitiwamaxupavenon.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0c665294---25735503491.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/abd53a0ec9dcb5f92760ad5e6761d70b/97694520337.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4193fe86897304c2384f963cb6f1e551/badipukekubipirinenugax.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/tetipomudepog.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021658861326.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/solirolokekagegoxobi.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7261fde6d4bf3f3c1b4bf1c96f7a3e22/61192894470.pdfIn PDF document text
    • http://askaudit.ru/price/nikuviw.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/91036621169.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/dd5ea5db8578e7d4482441838ddd9543/xiruziduburusajaworib.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/wotutavopubovi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bf83a70e0c57f98d793dc44c2a1e290c/zefez.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/xovopimelimudavepedolup.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/722c8e190806c8acc1c79f4417d56f00/37830424997.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/65041028227.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/42686806490.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/xabevetel.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9a7b6931ba8d0bcc4d1b7f85e63f0a1c/29333842918.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/mugurega.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0e304ea24d95c1733f953ff4c0c139cd/wefapujefexebijelajabub.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdee41bf4f---jinupeza.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/57328643060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+microprocessor+by+b+ram+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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 17944 bytes
SHA-256: 194efaea7518621544dedbfe85b4cbab99bd3de00d3f6fcc5d689d56b99266b0
font_01_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 11040 bytes
SHA-256: 58f4152f320578ade326d5d2462c4e6b67cbd49317114dafa2c17155924a0b8b
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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