Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddd019dcdb05698…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 12:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99d44c6172969b2902bd0c2a806ed877 SHA-1: 7ab14b9d5784dd4d00ce77c9a82ddf6e742eaaae SHA-256: 4ddd019dcdb05698cdd7844e9c7f00c3813d6bdcc4ec7e4c6f99df3423eb2830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trsoftyazilim.com/genelresimler/file/pogitubuzovig.pdf In PDF document text
    • http://epoxidice.ro/mm/file/puxekoxikazisugufovuxi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c1915e0a16f4518186fb1c5474b04ab9/wulukogi.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/41912869673.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/vigizewowepujaja.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/10199049589.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/42863260607.pdfIn PDF document text
    • http://e-sportis.com/images/upload/35627798481.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gufikaj.pdfIn PDF document text
    • http://aldercrest.com/files/30400355998.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/37249246092.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/fevololejan.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feeeec33f7---pororetawegapaxux.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/43639909674.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/mumejuruvula.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fapawemofuvopivaka.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/669c2f8e0c93c1bcfcea497465367e0f/sekapazavesagunofini.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed28479356---vozokofapuvisag.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wuvun.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/97655031867.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/83688703158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=curry+tree+indianPDF 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_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10152 bytes
SHA-256: c9afa7356ebe8f66891dae96f0705a92623f44266778e8420a60384f02312f4e
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 18532 bytes
SHA-256: df7c666daa70926276a54a67cb4e2f12bad3e113ffbad8d49d1d7b63a327052a
font_02_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1