Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca4d3ebf9590919…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 09:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d43d5dc2e8bc6c677f6b6c9506826d1e SHA-1: c2ff36760bf74768789a2bfb3d5aaa0d33234006 SHA-256: 3ca4d3ebf9590919cb08b4989404a89f6d6e30446efdce3a5d4d2a2bec72aa65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites hosted on various domains, some of which appear to be compromised CMS uploads. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to lure users to phishing sites or download further malicious content.

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://chcial.ru/uplcv?utm_term=quadratic+function+project+ideas PDF link annotation
    • http://ahxxzx.com/userfiles/202105/file/dijotopukopugav.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772cdc73dd0---59611356868.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/debemi.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/92tf0nm2a284hcv1uoocbrhilk/48746165526.pdfIn PDF document text
    • http://poiskvod.ru/images/file/nefozovusovufipoboxigut.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/90538772309.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/24780246267.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2f7c8b6219a959fc65e3ed8f4552f175/jazasadupuneviged.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077470be8ab6---96397050789.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/20060662605.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42c626cb4---35342205752.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161045bc7c4d28---23096593634.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/29f566e37be9a20f5718528870a344dd/70159955961.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e086d94a58e---tujugerekokodiwaziferak.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/zisofubutesudesijabemusa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f7efcfc12---17972657457.pdfIn PDF document text
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/86465496715.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/bajoxopavotokarafawejupi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160705e77a646e---16009346028.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rj31q0samcd45qtniqib442t9l/34561110758.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/taxepilupo.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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 10856 bytes
SHA-256: a6352d16eda92df39bd694143d2c9ba8a4fa504cad7fa081f9a61237ecbfaeba
font_01_sfnt_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 16204 bytes
SHA-256: 493006af3ed3c4bbb40ee71c08d0420af24ed7e671105016f224258534543ac3

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