Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc860b8287600de…

MALICIOUS

PDF

68.3 KB Created: 2021-09-18 06:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4e3f04081a12609c79c6a2512b0e9c0 SHA-1: 5e3f49a1fc796df1039c8bb05029ce0f02ee6e4a SHA-256: 7fc860b8287600de2c7bba016bde317f0487afdb7637ea90da27113906005503
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were directly extracted, the ML classifier strongly indicates malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=spoof+location+ios
    • http://puebloexec.com/userfiles/file/21346976001.pdf
    • http://retroldn.com/userfiles/file/tunagolexutasomemi.pdf
    • http://archive-2014.humandoc.pl/attachments/file/83961689966.pdf
    • http://sambometal.com/dataroom/file/36401062941.pdf
    • http://smartwealthhk.com/userfiles/79314651516.pdf
    • http://daiichitravel.com/uploads/news_file/33482521318.pdf
    • https://affordans.com/ckfinder/userfiles/files/76170648848.pdf
    • http://mientaytourist.com/uploads/files/fenutot.pdf
    • http://iberryhomemade.com/userfiles/files/jofamosoxamopobinod.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/efaf4d8e61cad59bba1638fe77fad10c/resijufenokubiw.pdf
    • http://centonze-vini.com/userfiles/files/38805177781.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/aeec62cdecd9c0abcd0b802896b16dfd/wigasotevefevuw.pdf
    • http://hakanhurdacilik.com/userfiles/file/kadutaporum.pdf
    • http://chokmanee.com/userfiles/file/didakewajuv.pdf
    • http://vilocom.net/webroot/img/files/32410547696.pdf
    • http://nguyenxuanhuong.com/upload/files/60796977543.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c43409ccd---nigipawogowisiwofisev.pdf
    • https://yp05.com/_UploadFile/Images/file/nesavolikaxisom.pdf
    • http://veterinariacasettamattei.it/userfiles/files/mijarope.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixufokebowepagez.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613243fac2e08---ralofex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000add8.bin
57488d45b7d10bf8828cc517dc0f5fb219b5d3bff3ee32105588bc2a5914ed3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADD8 15432 bytes
font_01_sfnt_off0000d4cd.bin
ba9b3c45136f87edcc8d8f301c938662dffe8f2ec50b9fe4844c3d05aab478fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 10316 bytes
font_02_sfnt_off0000ec28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 16792 bytes

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