Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5c623a0f5394db…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 11:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45ef82aaeb265d675e85da6c471467c0 SHA-1: c94206d68530835257a1bbc7293973170eb3f6d8 SHA-256: ff5c623a0f5394db293b431015d4dd144f750e8f00868fbfb7c47eb1142da3f7
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple external URLs, some hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.mnogotrop.com/ckfinder/userfiles/files/norolugikeduro.pdf
    • https://santaclara.com/wysiwygfiles/file/96072305778.pdf
    • http://basaritarim.net/admin/editor_resim/file/xepiwujenufazexakulo.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/19490564558.pdf
    • http://fd-health.com/upload/ckeditor/files/wajatik.pdf
    • https://thegioibaobicarton.com/Images_upload/files/11117104346.pdf
    • http://trungtamdaykem.vn/Images_upload/files/94290174788.pdf
    • http://iburgisidimarsala.eu/userfiles/files/riwasimutelitu.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/93846486363.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/baligagezotubewizarug.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e51b13b14e19855751d59fa9bf08dd32/52285162967.pdf
    • https://endeligmandag.no/e-brev/data/div/66515215389.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372105d1239---74771606480.pdf
    • http://maslag.eu/userfiles/file/25116711182.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/76982420884.pdf
    • http://mlsconsulting.net/cms/files/File/jizipetu.pdf
    • http://violetstudio.in/userfiles/file/37727736426.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161336e23575f6---37798494736.pdf
    • http://fructusartis.com/i/File/76624515740.pdf
    • http://www.mostenpo.jp/userfiles/files/degefopebiguropuvigus.pdf
    • https://laughteronlineuniversity.com/images/upload/files/93419051119.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=excitebike+64+rom
    • 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://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_off0000d4a2.bin
b7edda219f172cf02d19d609ea0656bad24ef075d45085605ecc04011bea81bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 19908 bytes
font_01_sfnt_off0001083d.bin
00c4672b22316deea8dbc01d524d6ba911067364f26f7517079cc72751e78ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 10472 bytes
font_02_sfnt_off0001201b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 16792 bytes

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