Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa24d9c7c2ebf66…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 22:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 050c2a4d5debae5881ec105e5c1bc864 SHA-1: 4d0de09a4ad6b8a8955ef3cef2b121c2bb816b34 SHA-256: 4aa24d9c7c2ebf66538bb6ea8ada3524f08db5d793e5554b179a3f2d7503e8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/835f4d68ab2b4dbd545af3a5c5ee84a9/46329562527.pdf In PDF document text
    • http://reklamaopole.pl/userfiles/file/wawono.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/xuvinaged.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0143317001631422314.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/wimidejawoxaxezifogazes.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/sonevedewukusuvevekesog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c7def9b4---poguralamotufodide.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/58426488854.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/jikufumod.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/7848940375.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49250664956.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzoruxamiwilivulam.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/puzusima.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/namararasibile.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/siletunutowosuribeno.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a67ddf5d991047da6a502ab3d0d6226a/48764310198.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/dibiwexatezosalinasowoxi.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/dowaz.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/17503781852.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/badewusisaduf.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rokejatopidigaduxeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+a+video+from+your+phone+to+your+laptopPDF 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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 18404 bytes
SHA-256: 295e5f51d5e300ee47d5d325bc96f281aebb154460e275f9c7e5478587c1a3c2
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 11132 bytes
SHA-256: 0b6d33f18f8bb059803321442efedfdb62aef9566f9a1c0a1cdc256c6f009450
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1