Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a215c4dfc7a0d2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 08:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a78fc04936f1f006b5b401f61b711a50 SHA-1: 0be7f3a1eccaa3a45bd8e1f99edc9907045ea7a5 SHA-256: 63a215c4dfc7a0d294eeeafd930a26ccd8ff4d5c85da1d95124c03ccdd5d89a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS upload storage, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cleartunemonitors.com/ckfinder/userfiles/files/93501728799.pdf In PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/bufunuwefuxanuwu.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/16127782151.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/15555208176135fcd4a827d.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///dumemer.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210912/files/20210912124444.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec60588e73---84808462169.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/41937884988.pdfIn PDF document text
    • https://media-get.com/userfiles/files/9242129402.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/nususugaderufu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kubigari.pdfIn PDF document text
    • http://sun-tes.ru/files/file/7383023888.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/dosugukaburazaponuseju.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/99160693721.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/miwevevabidasosopakibis.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/85091301371.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/11982c63fa22cb84925c47247bba439f/15670664944.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/50424918927.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/54635929887.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/kotami.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/29384913602.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ec833a1824a9a36bfdeb60f0889e5a9a/37220850709.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/204369082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=blue+bot+app+androidPDF 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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 10508 bytes
SHA-256: 44763a8feec782d07f88734fd6beaf1f3abbbf72aa09cd1bf1f3dd69890c01aa
font_01_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 17564 bytes
SHA-256: 74bb2affd48b17867818c2bf91e9ffc0b3a8a5ae9f205f0618477db3c3e833b8
font_02_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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