Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff0ced4d29ca0d9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 18:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc1846566cb885e9e48250bb756f0f1d SHA-1: f98d9f5d11fa7503ea416b7d8a7cac87aac9f08c SHA-256: cff0ced4d29ca0d9cb01c5d80eb087ebad9c410d43397fa440f220c002f1f765
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The presence of numerous external links suggests an attempt to redirect the user to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa8774ef2---vutesogisivo.pdf In PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/33808980313.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/95612144652.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/xobumig.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0a3433c4---rapavedoroxaxoniduzigu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/73eb9cf741f031722e9e09c4a75501b6/fiduliziporinavinexidok.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/fezoz.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0528rcja55mcdf9m02oqnm7kp/jipinebesotiv.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fl887u8if8f8sacbvejl2dda1v/xixuxusukebazi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/08esp5q5aaom5c45voe0trl0jv/31252294084.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/3554827769.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/gexixugudefufaki.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tadetiwiriru.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zedefekuxakigoraxolaxo.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/44906935999.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/alum6k440qu97jci9nqhel2lae/tokub.pdfIn PDF document text
    • https://majubesar.com/contents/files/81585228204.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/55156071990.pdfIn PDF document text
    • https://clinicscrm.com/img/files/81823434831.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e85e42548ff4acd12f93f76bbcf4688b/ruzozo.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/texelemivaledazojefuza.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hbgjgfrjhrfoegoghsugapk36k/xuzajugarut.pdfIn PDF document text
    • https://geniodelweb.com/file/15599237899.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/kufijozenevubofek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=celta+lesson+plan+example+pdfPDF 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_off0000bc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 17028 bytes
SHA-256: e299ae6fad24923a335eaef57f8c1398c3f9e33e753d8c21cdb96cda58506fe9
font_02_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 10600 bytes
SHA-256: f8cd222f2bb89304a59a5844fff3498f34a9ec9ce7cc7d5e869db84e90582e88

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