Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9ea0cf3bc95f45…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 13:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bf5c6b4fbff00fc88741d3f879560ea SHA-1: 3614efaa0f5fa271b0e10d44b3d9f7887c46bd9e SHA-256: fa9ea0cf3bc95f4558a9a152b244801e270914b0edd1effdcf42637d3dc30a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of embedded URLs, many of which point to PDF files hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that these links are likely part of a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://7seapharmtech.com/Uploadfiles/files/50138162268.pdf In PDF document text
    • http://quatanggiabao.com/images/uploads/files/5713109514.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/52954854629.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/jesed.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1c8b1b478---rawilafiramozipalonusozu.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/24966405517.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/womokejasabujovovovapat.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/bupozadafuxafogivugixeb.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/jaxugatutafizabameji.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161344cc916929---nawimoniwomemojot.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/86620889525.pdfIn PDF document text
    • https://33mobility.net/uploads/files/sapobetumorojimuromaxew.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/79122107706.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/vorigenoguvedef.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba1975fe8---25037395959.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/93243411181.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rapesakexeratu.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/37963583792.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/zazivudiranus.pdfIn PDF document text
    • http://quetthe.com/upload/files/41438714487.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/76944190779.pdfIn PDF document text
    • http://baove247.org/upload/files/4280971230.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9122298b---mapikomodurur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ios+file+for+androidPDF 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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 17016 bytes
SHA-256: c24d08986e96c4f05417d8da194a129c590d6122c7b27d4fbb580cf360282e8f
font_02_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 10200 bytes
SHA-256: f3a68468470244dfe224ec9758653e3c0fad8b1609782f3590133f2c0a8e8e3e

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