Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41fe1f2bdc0dfae…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 03:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f835f42a21a1adace392f30bc77a902 SHA-1: bcd2f02770734e57883db639aa4f7f2ee364ab67 SHA-256: f41fe1f2bdc0dfae576a71d1632a19b65df9ae118a469c4f6b0290eae605278e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.005 Security Software Tampering

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains a heuristic indicating an instruction to disable security software, which is a critical finding. The PDF also contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://acconpriti.com/ckfinder/userfiles/files/49653224871.pdf In PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/27480707811.pdfIn PDF document text
    • http://quetthe.com/upload/files/74311035106.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aaf653075---zoxodip.pdfIn PDF document text
    • https://temahr.hr/files/bubomedurufu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135515943ee4---74543284843.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/walebawakaramowesomolan.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131310dc8c1d---ripufuno.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/44916964935.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/dawod.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/parelure.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630988944_6669cd3d4c.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/rorudetinatifolaguv.pdfIn PDF document text
    • https://mklaassen.nl/images/file/78967961035.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/46393711475.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/90494722183.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fibevijolapopodulejes.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161303a82b26ae---gigupepuwozo.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/45811892354.pdfIn PDF document text
    • http://retailcop.ca/files/wokekurunobabukepeb.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/25214672941.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/23171624221.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/jixazotosabaxakigox.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/46124906824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kill+programs+androidPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 17192 bytes
SHA-256: bdaf63e81715dbb301bb93df55c40f3d747032f89f6953976df76d00b8311392
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10496 bytes
SHA-256: 0f7db3f9589052f9060cf151f10bcdd5c052b231b204398947e5275242c28c7f

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