Malicious PDF — malware analysis report

Static analysis result for SHA-256 467ea49bcbb79eb3…

MALICIOUS

PDF

83.8 KB Created: 2021-07-22 21:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c2a610d1786ec7027e2af19d4b6e44c5 SHA-1: 97f5b7dafb526c05ca92ecd2e0bec52e1c0ef6b1 SHA-256: 467ea49bcbb79eb3b7fcecd1ae5c6383f244a8414138ad0a9a3f4453362df8f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://begili.com/uploads/image/files/9387900702.pdf In PDF document text
    • http://summithigh75.com/clients/867147/File/73681729831.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a030247a104---pijevupiledir.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a033f87bacd---74402549779.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a89200f8---relarunegixovimaniliwu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/tefawobaxadexugo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2eeop6jvnnsqtia6e8f3vlq6b2/xudevafijetulafoxez.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nadinesejuteraniv.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ofhuvt8s3phpqs8soqkibp9kdf/jajemijifadozoxuze.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/potutuvuworijoxojulaf.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/16b208e27ddfa7f1b8b703e5e28c0c8c/22985108710.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a3c7d06a---10725373210.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/tobuximurinirowufopag.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/5566090404.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/53804135367.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b0e6543876c989fa94e1dadc7577230d/79027828372.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce776d441a---2543341478.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/solunedesegovi.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/38996453613.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/zosetapibevuvisag.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/34274473026.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/zojuvuwoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+lighthouse+counsellingPDF 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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 10312 bytes
SHA-256: e827750c529ac7ee5c99d0fb9bd03567dab2a1802657a913fc79ce45fa9c3a95
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16688 bytes
SHA-256: 44dd16727c548e62e399ffe4e29a304e8468fb0a2bab7efda34a948598676534
font_02_sfnt_off000129af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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