Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6053801448dfdd…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 07:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaaddba3b5326f4a37d65da2d27a5fa4 SHA-1: 834eff90f4efc812828373e65c33092e3b0c526d SHA-256: fb6053801448dfdd554c46cd9c70eed9a64f4ea9ad6aa93337004824b3e866cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fe9c0795ff2d2bc6448f2261d4ee3b6c/84544986633.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160810a3059405---vowisepe.pdf
    • http://selfmadefilms.nl/userfiles/files/15303716122.pdf
    • http://getem.plfiles/file/jisulolid.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7816df96f---namapuzoli.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/88351000940.pdf
    • http://transsnabstroy.com/userfiles/file/wilujobavamebijatid.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df007b6f7f---44135863421.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sld2s9alvfp3d0f22vs1lvti5q/siwejefotonuwasivuxaba.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eba5b4ddf---60277933518.pdf
    • http://guojingmall.com/userfiles/file///32205284496.pdf
    • http://dentalcenterstudio.it/userfiles/files/lalukusedukomimedo.pdf
    • http://dogoxuavanay.vn/uploads/files/jopiliriwogewedatobidivan.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8b82a27f---39540875572.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/81923230361.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/selogiziwunulinel.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975d777d578---xapubewawibuj.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0906e3d40e---kejajowibozenujenif.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6bda472f7---41837420346.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/xajelupipun.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffca16f51---87717599504.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=11th+commerce+accounts+book+in+marathi+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69a.bin
01c467a27f07b603d718f69f662d9a9dd02989b9854807e70a212154a87b3ad3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 17060 bytes
font_01_sfnt_off00011305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 16792 bytes
font_02_sfnt_off00012b1c.bin
4b469f2f7020cc9df9c5cf33f41b0e6c2bd828a49f4ad01ae759def10bf46487
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 11128 bytes