Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4a4a7b3824908e…

MALICIOUS

PDF

74.8 KB Created: 2021-08-27 22:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26bb4ccb7c03cf0f33753f43aea3dc7f SHA-1: 9481e7bb8db03398755ef02c75aed30311033f20 SHA-256: bf4a4a7b3824908ea3e50b93686608c0bef5ec7e337f533b353b83d49801bef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and compromised CMS uploads. The numerous embedded URLs point to various websites, many of which appear to be compromised WordPress installations, suggesting a link farm or redirection mechanism. The primary purpose seems to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=jean+baptiste+colbert+significance PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba1b63939---guxexuve.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/69211611136.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/xupukurubiwuzasa.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16220208975208.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a42b7367c---31423824690.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/74908993821.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a54e6518246---kedudamepufowaxabovotob.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/885889394df6ac2b72b0cd43d8b98845/vigir.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/10303048741.pdfIn PDF document text
    • http://svx.su/ffile/file/96183463012.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bunfo68v3uhv12mqq3tkmomjhj/xipulujafap.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210609_DA473FF44AA6DDF3.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/51183351280.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rckod92k256or1l7r6infl3abr/bugawa.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c9699df85---punof.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/7195971168.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/37825799061.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/61702191448.pdfIn PDF document text
    • https://digireg.li/upload/58099400847.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/buligerunebafijilonetowez.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/53747160523.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/78368467257.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_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 10784 bytes
SHA-256: 7c2c96954e56ab50886dd7e4f0d6b4368a3fc119a843daa6e6114b523b433c58
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 17672 bytes
SHA-256: d9001c4a44da0a34cda986387f47ac20d0e4c91652738a0a6d9b022b5b8b90eb

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