Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2894b52a14cf395…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 00:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d870537c51888debbad9352755b6960c SHA-1: 829080416e073adde4325099032f35d3c828c35b SHA-256: f2894b52a14cf3952fdcdaccde92f1bc3bd3660f72c5884e5d276454aabc5177
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=how+to+backup+normal+text+messages PDF link annotation
    • http://digifast.cz/userfiles/vuxefivufavosagozilaxerox.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/pironejodisalur.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///55890501706.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/kasekej.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/5799240630.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/gitibovadusuwima.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210912232212.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613142c66fb6c---31873321239.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zukakudanumalabakanuj.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/59528632953.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/zixefoletobidewefirotado.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/32729382500.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6a94bc860a13f90b451e687144a61e12/48526149362.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/6b2ecqq9p3i7fq6cii3j3ihfhr/63444259469.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/36302456746.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/49749686812.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/sidedefomuzuvubaxexu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/83624015808.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210918043507_477091519.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/11148145227.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/tikoxamobulabogafak.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/luluziwur.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/59908699764.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6a97641b9094f68825b35113ac22641e/80515827286.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/77297603434.pdfIn PDF document text
    • 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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 18516 bytes
SHA-256: 3dba98cf296a71120304f5d989df5f2ab53dfdaa0da17534d5c267a63383aefe
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 11136 bytes
SHA-256: 8c21692efe4547ee11bb215e7fce85aa417486452a82ddaf82445c79333f3929
font_02_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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