Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84b03ebde87a3ab…

MALICIOUS

PDF

90.1 KB Created: 2021-07-08 19:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7f5905b44be0e7c9a1793e979b09666e SHA-1: 2514d3bd9fb9aea2942a24f2e9258dec5011fb19 SHA-256: b84b03ebde87a3aba2f8c4417383490c1574723b19cc1bd00189a226bb730f4d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://miroslaws.com/ckfinder/userfiles/files/dupimiru.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bb82f98c---16958135632.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/masalatenizi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8j8hp5079q18u90bmnqiigu9aq/gafoxolivebitazikatizezig.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/doxomolovo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f2314d57717e9d9a298e722658aac703/97970518508.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/linarobodel.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47763eb4e1---tovufukedabeguvodufokosu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a60739f4---57652417684.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/24964254076.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3b51a68439c728945b41e16f73a1238e/reted.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/21625264038.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/93312516186.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609909d9639a9---bojejefewovawozutelosuf.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1p624th87ojrklvs7b8ihu7hcg/57928772917.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j377im51jn8tabr0frdheg7rp5/nakezikizasifufiji.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084842e8d200---nunesebuzupanomok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5532880853.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/guwopuxebasazulaxase.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e6e26b3eb9f272dab5b0c94be539564c/suxuwozifisekudilapin.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/241901015.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/68747392591.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/60499eb3195d5d8eee33d3da96503c57/27379065967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=assignment+plagiarism+checkerPDF 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_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 16788 bytes
SHA-256: c8382796edc831f045a93005abfd15347007fa77ea0a7c1aad530d000e524356
font_01_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 10772 bytes
SHA-256: b80741064077ae5051368eb4c9d73eab8ebd7058d694255eb7285262e345ea02
font_02_sfnt_off00014324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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