Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb5dfcc60f509bb…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 18:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86dd50ad16322f428275cb75686e9783 SHA-1: c739873055c44359ee6bf75496672f29ce2a0bd5 SHA-256: 4fb5dfcc60f509bbe341e76a53a7c02ebc22e20f7cbff6eedb23ab449f7c8088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting to download further malicious PDFs. The embedded URLs suggest a lure related to game downloads, likely to trick users into downloading and executing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qojavs19ig7ltpruu6pp8tdsm1/lajifujufabaxuz.pdf In PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/wanaridijegok.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210910_195152.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/buposub.pdfIn PDF document text
    • http://dd-eng.com/files/files/fitetulirof.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1df53df2---6238575594.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367285da6a5---82827319560.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a3f6f5d4---51525585687.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/35820210825.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/64342481475.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-18/images/files/36153477858.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/61f52704196e41075ffa3df658dc086e/19745508498.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/79141266619.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/91886843257.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/runuruxozezokuge.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/fivasedimelo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/7025412393.pdfIn PDF document text
    • http://sksound.com/userfiles/file/tanulumilatexenu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139f900ba711---13270025751.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/20984461127.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377bd20ab1b---gejewunavunexi.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/vulosotas.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/50752111283.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sudesirorukoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=assassin+creed+identity+apk+free+download+for+androidPDF 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_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 19736 bytes
SHA-256: c79b16dc2be2c594b612fb6cb40339126411cdcfeaa3118f53055653eb0ce5e4
font_02_sfnt_off000136ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EC 10884 bytes
SHA-256: 6f10334f30bef4673c4f18ce4963a8a4c25e3884088d31bb17d5f3dcc7d42c53

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