Malicious PDF — malware analysis report

Static analysis result for SHA-256 0451fc05e4252bd7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 23:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5533fa07374740ab783d69145fff90e SHA-1: e867db39e4381a489cb99a86226be33ae8b79852 SHA-256: 0451fc05e4252bd77c656fede977c640dcb0f118c9e00e8aa171fdc6970248ea
164 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing a deceptive download button and a link farm pointing to numerous disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=mafikizolo+ngeke+balunge
    • http://netcentricnj.com/ckfinder/userfiles/files/xomudeno.pdf
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/laxebonevenuwowoza.pdf
    • http://okvin.org/userfiles/file/16353704531.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1fdee18c---mukam.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3079c343e37a2eba751219089b7d6012/lovebewogiwiw.pdf
    • http://librojuridico.com/aym_images/files/jizaxor.pdf
    • http://healthywithhart.com/res/file/15733120102.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16142571102a6a---junaj.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210914_C7861AE5FD5BDB4B.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/tamofalaxikixe.pdf
    • https://curtain.jinware.com/upload/files/47461528895.pdf
    • http://asupuro.com/user_data/image/file/99673537260.pdf
    • http://qazaqbanki.kz/data/content/files/69210264279.pdf
    • http://tuclubcr.com/campannas/file/rolepagowepap.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/kalaganagivir.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4891f29e---kuwujefemukabute.pdf
    • https://sproname.com/files/userfiles/files/82808900541.pdf
    • https://notarbrazda.cz/userfiles/file/
    • http://homearcky.nl/userfiles/file/sopeperekivozedojuw.pdf
    • http://oecschool.com/userfiles/file/luximawofivozo.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/20825217025.pdf
    • 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_off0000b8fb.bin
cde2ece509abdb22221024e864876df2e7d7dc3a2ba3b6c27f2112afde0bb0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 10408 bytes
font_01_sfnt_off0000d0a8.bin
52cd780c238c5a6ae7c1a1f4888ef27f3522249d86e598189c0de11ad15bb757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 17820 bytes
font_02_sfnt_off0000fef8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 16792 bytes

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