Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8c54beb5fe4906…

MALICIOUS

PDF

90.9 KB Created: 2021-08-07 17:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb5cb2665a1a8493ad4bf881de741877 SHA-1: 4f6246ae8ba2c5b367885c6d2663c8461f1dec72 SHA-256: ae8c54beb5fe49062d542ef5334baff79956fb395dfca16c2c8758f5a84be06f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure itself is also flagged for suspicious object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yellowstonewildlife.com/tufenuzineno.pdf In PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nixepidebomafiwo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c376e3a3c---jajemetomikosanadi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/735fb75dd9fb6bfdeccfe47b43be9e28/75933502179.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c960dfd6d07---32090015771.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/mvjr6lla76gnreibe4fsj3kdd7/64280617140.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c22kvam04usmecejfbo6vcocg2/43594846152.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/peranumex.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2764e24d---nepazasazefi.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/145be149ab3f031521617355c6ffa7dd/54211085342.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rvc996i3fak3c8vnts7guuispr/36025510630.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n6ndgpbn97kqffisb4n6ajnlj3/jonelulonizomukimujopuziz.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/vobagekaduviw.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/dogaridomexowega.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/53813590224.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4b57f812---duwemesapekozujinu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/724af4663e39c1274a8c1b78507b597a/pokanujomoxegib.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dd96de74---gigoxofufidopezositivugi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xozixibojunusuzesejokefet.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f48aff6760a---pakukezunogijifad.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfc5811b5---wojulakor.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xadeluberamamowuri.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/85966782629.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/65a57c50179fcdaf9312af38441693f9/sagugosisesikini.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/912c10b95f7d745e2bb71f25e50e1774/guvofibesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=international+organizations+and+their+headquarters+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_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 17292 bytes
SHA-256: e01d65dfe1add73b5aafdcac0bcd229ecd4654e88b34d65bc1f6ad901c93fd7c
font_02_sfnt_off000144dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DD 11036 bytes
SHA-256: 1ec18f251c9c98ccc9180f29b51af1a4cf3780fadf3407fa4e93dae28a0dbe84

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