Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84435350f3d04b1…

MALICIOUS

PDF

89.0 KB Created: 2021-08-07 10:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 09acbc1bb1ae9401bb5b7714dacf1f5e SHA-1: 867414a49bdc85b55000d9ae0650385bc74379c5 SHA-256: c84435350f3d04b1a23a932792232f83e098886f179d3940decc2ce9ba64424d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a706dd0364f---jibezepepexodikukedi.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e333ad11f---kumegilaloxetevasutu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/33296415889.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b805854e5ef---27121595729.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xusolatasutipozo.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/39222606601.pdfIn PDF document text
    • http://mousike.it/img_ins/files/dalevevabazagarepetupubeg.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160895ce16f16a---69299721867.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jonipemurudakevufopipaz.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609024d1856a5---86490895732.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/21706185394.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ft8qih2ekj2680ogo6oi10s2g5/zavutofokipudebatodatop.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/vakixemadeja.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/83873304287.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cf75a7ec---mejefenidegevoxenaposubu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d587d634f0---nizafibuju.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/jexowakanidejujezokixulem.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p0du1mq7pj4v3j3dhfo1g2j25i/sivemadiludapal.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/vedufijatajeraxed.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3b6233251aa9c4bee08c162b9f3c6018/98730252646.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/safokafam.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///fulebepazub.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa9484397---wanafutakar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pixellab+mod+apk+unlimited+fontPDF 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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 16772 bytes
SHA-256: 9b428a9731b8f817e44f5c0fd6d6d855b0b2f08f7f01c62cf911bfb10941029e
font_01_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 10828 bytes
SHA-256: 21ff4a04042ffb0c5f5c9d7e7e0ef3eb3a8393e556e3d4c9e1de44619addad03
font_02_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1