Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4ac76fc9978a63…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 01:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acdaa2e5edc54dad609c9ac7e264d021 SHA-1: bccd3e5d79d415167fe74bf47a0ba4a37ce765a3 SHA-256: 4d4ac76fc9978a63abf704d9d560d2d9f00415205a7702f2747f2dd2f9d15ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://riggi.ru/userfiles/file/genemapumedigigiroxifefa.pdf In PDF document text
    • http://studio-castiglioni.com/userfiles/files/33431122257.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/tolodibofan.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/kimotumugefivawomoxafe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1aacc3f9---bodalozukizimidezes.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921b6f99e82---82740656485.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/53019540623.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/zoforedajibolupekowitivin.pdfIn PDF document text
    • http://proxima-design.cz/files/file/1101292851.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4558c17f4---bipilaxaludesitakogetewa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f856ac481ca---93502712953.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/xezoxuvigupugututule.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/33254633106.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/36340603219.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965e22a7a7e---35413990634.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfdfc1626---gukabibi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160748b4ce99b7---didawo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/10653609486.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/50c0518c718c9b68b4e5b58445125fed.pdfIn PDF document text
    • http://tianfonmm.com/d/files/genagax.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/raxelibedixowizikut.pdfIn PDF document text
    • http://rilta.net/userfiles/files/10308878863.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160799d44cb783---44835204557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vanuatu+map+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_off0000b748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 18804 bytes
SHA-256: 9ed65e7c364b1bd5bf6223964d3375e73e5642febe05c41de4e716862bf24af1
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10068 bytes
SHA-256: 55b45dbeeafcae663fadac7a6d09d3f581cf17b406cd325debe51af17a37593a

Open this report in the interactive analyzer, or submit your own file for analysis.