Malicious PDF — malware analysis report

Static analysis result for SHA-256 09565acb63c7cd20…

MALICIOUS

PDF

87.2 KB Created: 2021-08-12 00:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5426165ba7517bb0b93e130804392ba4 SHA-1: 4d380d06cd2fc45d33d77344b10710ca9bf255e4 SHA-256: 09565acb63c7cd20a7cb82f0c67123a2b4eebfbb21799fa7696a1d59d1971c53
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0377837ff10959d191c356b4c9319152/43560469617.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a954d8890f---22442499988.pdfIn PDF document text
    • http://dsraxys.com/uploads/jumaruxu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/27075192701.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/80316909944.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/pesubenawovo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f12ec1f9e47e393c88ca5c6160e979af/94145583566.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7s24sk0ie1hqthqtumpnv8hbc4/dikovukogojululobazox.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/tetesetulanorini.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160750c0e624bd---10928155566.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/juvoli.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/27400404055.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/febujufozonewuvifez.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/20785766718.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092525479524---90708611254.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/bavijufamad.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/53629090732.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/rarukuxaxedobotubaj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4deb8d549---zoneketomiluxojozesakepa.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/97688745732.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf39c90ec7---wuzowiwotebu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eabeb2ae95---zidikarubeboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+clean+ink+absorber+canon+pixma+mg2520PDF 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_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 11504 bytes
SHA-256: 20544b18a1a2440d2e6033b16eebdf0307993b65b02013a9918c9892c57856e4
font_01_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 17720 bytes
SHA-256: 5c16a739dfb201dda9be1c0f87dc25e4ac13297ee7914f72e7f6c2c0ce9abe83

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