Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c73cb96995df33…

MALICIOUS

PDF

81.1 KB Created: 2021-06-22 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63e509c458e4c42e49a58e5d8990853 SHA-1: 9d2ed2f48bd4be797d9c3271c9b87bf92dd5c3b3 SHA-256: 59c73cb96995df33fe5873e9e6bf0e8d02ba9dd2ef71a3e560a4c2eeb06a7334
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://open-call.fr/uploaded/files/mamipowodad.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4b3ccd2e3535a59d9bd1667f8c3414a7/7457784827.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de88982743---denevusadexajijexelirux.pdf
    • http://www.anjhimayath.com/upload/file/genujafudedufuj.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077193b00943---zefilusi.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b893114561b---wobubinot.pdf
    • https://eternalbliss.net/file/sanifimuvaxitovuvutupum.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a5437520c1572d2e237d7c075d6b0642/kamile.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/44075750706.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3057e44d---37723737291.pdf
    • http://jfk1969nola.com/clients/873000/File/28476907526.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ngphleb0hbt0365o7bsvn9i41r/53200138067.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/29u5tn5r11i7f525ncgosdmfqj/62454159791.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd94aaa66f---wimexijinijiroxanuferame.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fb842769---gazutukefelugotifuworiri.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/lumopiwopogopili.pdf
    • http://musikpark-live.de/userfiles/file/lizuzam.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829fe269bbb---pifefov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=to+build+a+home+free+piano+sheet+music
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f5.bin
9c3b1876bec22f8ced4db5d1e5f01d293bb1eae5cd72525b13b0fe9d512e26de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 5484 bytes
font_01_sfnt_off00011466.bin
86c46b5fdfc9a537448c2e44a155145f6e8856219641d21922f199b67805a8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 10104 bytes

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