Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0130239de7cfb5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 01:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 152aad7ab82605066667d7493215e7c2 SHA-1: 539a4e92dbe9c2041a485cf6acb80f4361a3f92f SHA-256: cf0130239de7cfb564b09209a8f0fa5f8cee17a715f67ed0ccebd2e60d83ade9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The presence of a 'link farm' heuristic and URLs with 'utm_term' parameters indicates a deceptive lure, likely to trick users into downloading unwanted software. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=hitfilm+video+editor+download+for+pc PDF link annotation
    • http://sarkar.ie/userfiles/file/86967924125.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/29070723292.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/58139735390.pdfIn PDF document text
    • https://cubic.is/userfiles/file/76135881752.pdfIn PDF document text
    • http://1carl.com/userfiles/file/99507654669.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2e0fee065e6b31f2bd85d77c4ae41a9d/66784083300.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/95663158227.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/26444229630.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/64129264930.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/rigenitovasisux.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161475563a53d4---niwerajizip.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/71533097861.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/89250437934.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/98566352560.pdfIn PDF document text
    • http://status.cz/UserFiles/File/15231346688.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/68979921256.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/92876431113.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/30081155358.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/vinosivupiradefidapojo.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/tusigovedif.pdfIn PDF document text
    • https://askflip.com/uploads/files/30935279551.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/81081428385.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486655571ce---69370063009.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/73662797261.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/kefajisap.pdfIn PDF document text
    • 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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 10756 bytes
SHA-256: 493503f9b5a3f95e5f77284759d4329bbabec1b1feab70cb401742df2363bd12
font_02_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 17392 bytes
SHA-256: b1ece64ba70c5986c12611bd62e8e1c6cf5e8bfa90baf7b11d58d4bc5742fdbe

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