Malicious PDF — malware analysis report

Static analysis result for SHA-256 5530319be45559ef…

MALICIOUS

PDF

83.7 KB Created: 2021-07-13 13:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14814dc540460143f7e4951cfa943f29 SHA-1: 82bdc691b690e96bbca46b267f24030d7174bb23 SHA-256: 5530319be45559efbbe0115ef495b5ea497a4c284f7c51be8ee453c9061f1a8e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://satunatc.ac.th/ckfinder/userfiles/files/viwapijagexukade.pdf In PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/o23vqvnen2vfsc3lr4c1m06036/jiwabex.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e0dad59d0d39e2f9f3279fa28fe0d2a7/58108705438.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/kanokesiran.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/1144147298.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/83994227565.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/86d28d7c4aa8a2ca4ed52d4294f8576f/95922183582.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607306c7b35d0---vototawuzob.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/livozinutop.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/ruvetivobuwov.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17812641227.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/57695890986.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40edee3f47---nuban.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/45b48e556db42644a5a03d061bcc5a11/72871508863.pdfIn PDF document text
    • http://jkohut.pl/file/pumijelimeg.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/su47ak9jm1gbgu8fupgg7pd992/73936411687.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/bc67cadc127f6aa6f135a341f7e2b14b/99345875069.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o5psarg34g6oin86md80345p65/57062434420.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210707091352.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/xodobafuwoxoreranufefetox.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/nirolesonoburagasufimogu.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/47831941862.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e46a7528b---49784931558.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/67522638990.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/23373915826.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/97618915804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=prospectus+in+company+law+pptPDF 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16564 bytes
SHA-256: 272cd05663b40da48342f212365d31126ea043c65a1847fdfeb1e338cdd6b247
font_01_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 10836 bytes
SHA-256: 161bdae2d3377a1371b714e561d9bb76ddd136afb2b6af94ef100094156c467b
font_02_sfnt_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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