Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff945b1aadee0164…

MALICIOUS

PDF

77.3 KB Created: 2021-09-24 00:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ccbb20d2c50426e57c8cf1ac0513ae4 SHA-1: 0ce3fe44f7b91710badbf6c683f8d08b95dcb1ae SHA-256: ff945b1aadee0164465447f8d336e8b01576cef3cd15ebf0c25d60e852bad9fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, including those hosted on compromised WordPress sites and disposable domains, indicates a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=fingerprint+in+android+studio PDF link annotation
    • https://nordavril.com/userfiles/file/bifusavixuvudogereroranat.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/78221013300.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aa194ad98---41081582692.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613669f438b54---17349612638.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/90478012024.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/penepunu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/midunabatofa.pdfIn PDF document text
    • https://teamcode.net/upload/files/pefaxemegolaju.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/rebevulivogukelazo.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210907_084820.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131265197678---51928244671.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/zuxiluk.pdfIn PDF document text
    • https://sealskinz.ru/files/file/6010360332.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bupogigezebumuxixinubav.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pedulesukiwerom.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/86375662213.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/lowimiromaluxibalumimu.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/manawodutadifaxiguxero.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/98600815707.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/lisopiwulevatupufalare.pdfIn PDF document text
    • http://stonebreaker.at/sinukuzelukekinon.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/vopakuwapapurak.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/8450928843.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/mobonoxitigakalunopetivuw.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/kozib.pdfIn PDF document text
    • 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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 17952 bytes
SHA-256: e6f3ed4c78f3e07cac6958187bbd9c57e354b086e61c95177ec25a617bcf4eba
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 10596 bytes
SHA-256: 10bc2ba8605dbd3a1781c00f50f2a81aa0eb9772e30f2d03e2179d86c58c117f

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