Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7b3ef24d271b6f…

MALICIOUS

PDF

97.1 KB Created: 2021-06-14 22:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5c7009c94bce60fe0aeae71eddac9b9 SHA-1: dbefb0a4ef417df9c658a5d90e08945ccf9f0eb9 SHA-256: fb7b3ef24d271b6f21c4cafa987dbbc2b30898533bca2d1d56df42531550b864
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The presence of a search query in the document body, 'What is the capital city of the northwest territories', is likely a lure to encourage interaction with these links. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=what+is+the+capital+city+of+the+northwest+territories
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af8de81f54---43426829241.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2de00f392---62488151606.pdf
    • http://altelaw.com/uploads/image/file/39855744137.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072001f25f30---xaxukegazapenefesunul.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b632fb715f9---zopitanomuwub.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc828a74b---81997074690.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/jhvlesine5ug2ru11jpqfa3p90/46610417464.pdf
    • http://seabeachthailand.com/UserFiles/file/nitavoganibep.pdf
    • http://seoulsquare.com/userfiles/file/26149694835.pdf
    • http://www.iece.in/userfiles/file/kizevefosivaz.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7nlamne8t8s1oah5t0s82qlkgu/6336641465.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9df354083f988a0d362028cea8a45fa5/94449468661.pdf
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/57de089fbd467b5fd1a5d5269c4fce34/zisekemidilexirinepuwij.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d501f48ad0---muvesiraguz.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893a6da5d13---21118083327.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vpj37np35ss474gu8nb2kgkkfq/pevizuwiveninatasidilanuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off00012833.bin
3a643cefde6dfbd957117d7c34c97f5cc35e2419cdea608e271ce2615eff6620
pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 5312 bytes
font_01_sfnt_off00013a5d.bin
cc215a888fb883e8700483be01ffa02890dfbd8c8c2d6d00097fff5e76037189
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5D 10884 bytes
font_02_sfnt_off00015f93.bin
caac5f4713460bb22cd97ade6dcd74c4dded55c80dd1225a93128929eb95e3ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F93 16184 bytes