Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e1a9b435485dc6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 11:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44ecc9f1a1a2de80a156f9826bc8e880 SHA-1: a61c071cfe89177d543cdaac9ad62a4c2d8c843d SHA-256: b3e1a9b435485dc61c7daf1690315b775e2e148bc99c07b245db45c5fd09afc0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://ztkammer.at/uploads/file/wolajuxi.pdf In PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/xikupuxezanozovaga.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/kasar.pdfIn PDF document text
    • https://securitydm.com/slicice/file/foxatunigenok.pdfIn PDF document text
    • http://ned.ru/uploads/files/midedajowidegibivezim.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/27523324848.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ar1qq0rpq5fhnrsqij12uohal3/japimabukubejun.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/54611647528.pdfIn PDF document text
    • http://normel.org/files/upload/file/lofojotimiwep.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d660aa3abd---69389958983.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e75d36f5acdeac15374fa98e9fb5bd18/vazetokeda.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b58e4fa45a58d914e93aa3fdd43fe2e2/vikifufonisakuduka.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/sofek.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00fbfe731e---18045166633.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210706184853.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/f538a722272fcf4475cc5742ef2857b9/gorazoz.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/bowafedifore.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///6578693943.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/72847487927.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5d8daa205b92857820b798603a4827d1/30575784649.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/28441367612.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4f871f76cce58ee35c4b97ccb64ddce7/pafaxizigijorutigoridago.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5394b2d0a---97251806603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=npt+thread+size+chart+pdfPDF 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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 15924 bytes
SHA-256: 9e054f97f4ff871bd3025d6d8727e2e80245e22c3cfc4acef4c775bf0a52e413
font_02_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10484 bytes
SHA-256: 15cd02134850a3622149fcca23416e7b0a0227cb8e50581e75e8a5bf29fdee3e