Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8b2d2919c2a62f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 09:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9abf8d93e52f1ac87c4de7bb8825baa SHA-1: 02493c95d2116f90f0b371e2a72826238bdb5971 SHA-256: aa8b2d2919c2a62fb7d0f0c4173cf7af7be149230d4ddb007f6bf604e9381db1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42d65ce19---40459954584.pdf In PDF document text
    • http://96rangjai.com/userfiles/file/84960303824.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202181075398709.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7kgssdg26iivaf1vc3atq9u3s5/79127740803.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/94074869199.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/75812342834.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/79355122573.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/mufumikigigo.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/47307895645.pdfIn PDF document text
    • https://rm-parketi.si/uploads/xexeporerotawope.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/detobeser.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/43147237856.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b412996e3f2---lerexa.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/tizobeladalerawagig.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/70775697679.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/zasojijakakupupo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1264225349620825238661f17f77f918/97625303556.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/90336924017.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/24841733442.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/62411156500.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/vopuviwi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2e00cffc3---linezatutojudok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bangladesh+budget+2018-19+summary+pdfPDF 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_off0000b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 17224 bytes
SHA-256: 942fa792dc06d0ee2d07867fb49aa8ecf764a38eff42afe47782e7ac8514191d
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 11844 bytes
SHA-256: 0a5c757d07b7bc4a2d8d64269601c998349b9aec80d748af34cf4d28f99466b4