Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4ab8522c68e27d…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 22:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 961929b4c208d09e320038f39504a831 SHA-1: e163b01af0e17d6520e07545199b80fd75f0cf7b SHA-256: 7b4ab8522c68e27db88694b544c0398151f5b0f79944431293b51514689eaa65
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://sieuthicayxanh.vn/webroot/img/files/netukobufikemupuseluvusij.pdf In PDF document text
    • https://mgs-on-track.com/uploads/misc/files/bogevijasiruwunesosataki.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1219b5bb---vumorugazojanemasegepuna.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/71394305540.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736668741c7---dupukaxamavarevivivap.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd14781188f48ca03a3be397b269781d/rusogebawapujagorove.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9e0801a4---womegosazebegamise.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c13430557f6---48590639979.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/n92h8v5p97grej6v6h4na9f0n7/8241206027.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/wozujikopuz.pdfIn PDF document text
    • https://rajakedua.com/contents//files/61582232698.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eb83a867---17085738550.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/52255095033.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/5699926830.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/79756496974.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad8b4fcad---xegafumegixufuravedazet.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nh8k8ngbuvscs6nj5ugcomn6di/vunalezix.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/90344140109.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/94342444654.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/52359892776.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/vewenivesizawijezuj.pdfIn PDF document text
    • http://93564497.com/userfiles/xosulom.pdfIn PDF document text
    • https://bloomeng.com/uploads/31635665625.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/wolovavevun.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1d3tsft3hchtip0s195r70n7jb/rudako.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/58820799122.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca1103d69---89109448437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+best+arris+modemPDF 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_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 17652 bytes
SHA-256: ff9ffcc7a5b8c35ede4902e885e92bfad01f83d9476cf5076c8bc57b8a11a621
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 10496 bytes
SHA-256: 032ae43329b8df7c5e64af58a0dab50d0af51d32db00aa0b8d144203b6b6e0de

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