Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dad5d7cf854276…

MALICIOUS

PDF

106.9 KB Created: 2021-09-11 00:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25308560fe1d9a95018005a8da7de1a2 SHA-1: cfd581e2d46ca0050be3f1924543bdd386408450 SHA-256: f8dad5d7cf854276db5b6be8f9ac417c6afb7f7f6e3d44bdf0d7486224c174b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded JavaScript indicates an intent to exploit vulnerabilities or perform malicious actions directly from the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://digireg.ru/upload/nikaxojepef.pdf In PDF document text
    • https://nanyangtextile.com/userfiles/file/11125333488.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/fapiximorowoxirox.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/85197802614.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903012326.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/31043211185.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/36151570568.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/dobaminarajofuro.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/suwumegajisemefaja.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/20370497582.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/lenaji.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/41350629002.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/lejeguzovezixelenotazof.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321eee41ab9---vexuwupuguduvujepe.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/82476374042.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/xezokanototimasi.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/nowimekotefapixigutikiw.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1d6a7d5fa4153896c4e549cb15778be4/jepabogenuxudipivo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e87dcfb2d2f4c4cbdd1d89896350ddbe/revoxuruxabeninaxuse.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/35k21jnga43tc7vqmqttab25ns/neragolinijopejitenexoba.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66983689793.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/wadekubakutanirizavil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tv+box+antutu+benchmarkPDF 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_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 18992 bytes
SHA-256: 190580f5615016ee07b417bf7d2bbef0b3abb05707aac6f9976fd8acb9f547ac
font_01_sfnt_off00016e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E00 10652 bytes
SHA-256: a3760e58f5fb7138d35f1c7d6b0680d355989423fae74835d5beea7c82f16b70
font_02_sfnt_off00018649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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