Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c636b52e414201…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 23:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 753a70c53dddbefef60549e29b9e05ea SHA-1: c1c8d2ea6b02c47f761905728466bfde0bb48121 SHA-256: d6c636b52e414201cfd6a9164a7516ee22e322871507f7009850436b54b2e4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=epic+minecraft+build+ideas PDF link annotation
    • https://ayurmitra.com/files/file/16116901691.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/feburegozo.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/9191596107.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/37664674280.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/65169655311.pdfIn PDF document text
    • http://eksternest.be/images/file/59230238601.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1e11e948---56792734093.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/zawopubowotumixu1631037791.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f3437ee3965fe832d510df910db8d7d/78447603185.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/82263652727.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/67967751277.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/potiriwazipizomafivizu.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905224632.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/bawimipiboburususadagex.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141566a53f0f---79882874093.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/nonuwekakodunadag.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/ditavif.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c1517984---naribej.pdfIn PDF document text
    • http://hingliltd.com/userfiles/gapirodelakimoxigewalava.pdfIn PDF document text
    • http://ranchobg.com/img/file/9911767477.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/12037272296142c0f113fe1.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/39958952963.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceef33711e---82593862554.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/60635234844.pdfIn PDF document text
    • http://denge.aero/upload/files/vewakudo.pdfIn PDF document text
    • 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_off0000bd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 15612 bytes
SHA-256: 5c0042dcfadadc53ccc2a4d475a73d9941ce9fc17071224f5cfbb22b27d5137b
font_02_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 10884 bytes
SHA-256: 59aaddb4ea55b248f1fac5c24231685dd8c573471b25b0d992b9a25805ebd3cb

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