Malicious PDF — malware analysis report

Static analysis result for SHA-256 293721733492c716…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 16:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21770527fbf2e002cae683365154cdb6 SHA-1: d69375c00623ce3f028b4eb5430505512d99c9fc SHA-256: 293721733492c7167bc9eeacb1dd0f38b8f66b42db4ee30b0d9b39f95983ce50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to lure users to potentially malicious sites. The presence of these links suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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=feline+acupressure+meridian+chart+pdf PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/35082951112.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901033234.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/pefotigigipojo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddde96d961---16390115458.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f4eebbd8---datowigodesefon.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/tufubotima.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/73053872858.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/14667681473.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/remepodukupubezeluvanu.pdfIn PDF document text
    • https://wonkingchina.com/d/files/dijediwoko.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/41258621710.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bd47e175---49979700844.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/20045295945.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79f064d73---20915013272.pdfIn PDF document text
    • http://erpos.sk/data/files/pinoroxivalukupexuluzosu.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/41477749734.pdfIn PDF document text
    • http://wwstationery.com/files/file/25240472409.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/vuxiruwojafuj.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/87334609065.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0ecddd6019f81d969d74d0aa05bed54f/fevivowevujarozeg.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/55169078086.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/43872594269.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/21930350029.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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 10844 bytes
SHA-256: c35d6eb6ca5205ffc89ef4636ed814e958a1bd40516ea6789818c402cdf77cca
font_02_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 17892 bytes
SHA-256: 108e987aa39410a16faafcd870b315537fb7bed1122caf6f9edf248b9c8ff00e