Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f9408b8fa9269a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 19:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 502a952d7fa445a6b4e1979b468c7341 SHA-1: 03a82aaa859ceef157a9a73098b9e433330b35c4 SHA-256: b0f9408b8fa9269a076846e8858cf0ac4a6cc219f1d5ba55962032e5dbb25051
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e896d89f344---vukarosiragig.pdf In PDF document text
    • https://giverny-bkk.com/upload/files/zubudugegizojominixo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e14c83e2db455b269295517f4f7a105f/mivejum.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rmq6sqf70ponfhvrb7c366erc5/tewexududizijodixed.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/46200246676.pdfIn PDF document text
    • http://email-database.info/userfiles/file/22665713521.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/83250063834.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/7173869085.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/sojepujovogedesogexab.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/lexamozo.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/30192062197.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tifubededupalalowuxu.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/55737812723.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e43d7dea---59032626617.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/24212041519.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831998a7f88---medajo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/32528971734.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c5676453---xewekimebifuremukun.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/37fc0571e680e75dd0a63f6dba4b3bd8/bazinamijoxufukaw.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/fiwelataxaraxagivo.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/38142020689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=report+card+general+commentsPDF 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_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 10812 bytes
SHA-256: 183cc7bcb2af499b9cf2c3f453d422b2a09ad5c5e4ed80ca8eb73b39fc95b43f
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 17272 bytes
SHA-256: 8b246ec021dc951f9d236a36c71a4bc32f3eaf1975cabddb0992b0bc21984901
font_02_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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