Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1a8cf30dab2896…

MALICIOUS

PDF

69.5 KB Created: 2021-09-11 22:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f5441ce6b199f4ae472ea171816078b SHA-1: 06918d965e83f561aea99a468baa5aec47d9ac43 SHA-256: 1d1a8cf30dab2896e29d5907c4286b83f39e63b705ab55eaf3a96b9d729ce218
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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613413fd8ce51---7075133055.pdf In PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/4991733121.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/37653646810.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/55727236258.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/tetiwabezezodebaw.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jimepaxilo.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/94966648911.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/wiroguwe.pdfIn PDF document text
    • https://tadimtursu.com/image/files/zuwusa.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/57681861589.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/namijalagokelurexikebixej.pdfIn PDF document text
    • http://holzweiss.at/45376895713.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137beb337881---78571574603.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/zamununubejefakipodejid.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61470481773.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/worafozonef.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/sodekupamekepuvin.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613538867d537---gogelaguzidopopufa.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/nizizozapebifutijakam.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/jirodobaturigidafilimar.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/zejeramurobaluloxigozus.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/67643104280.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613be44b34cf8---43787969518.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/97323477492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+set+language+programmaticallyPDF 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_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 11052 bytes
SHA-256: f76b12a7071b45c7d720bda81b954e162363482c27274526d881646d89f5ba91
font_01_sfnt_off0000cadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 14912 bytes
SHA-256: ae4484258922a4bc1d346de07d8a9fb46adbe58bdbad80c84d6b6357f2409a19
font_02_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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