Malicious PDF — malware analysis report

Static analysis result for SHA-256 776d65c251b13d26…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 03:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4c77e20c395d9df3616289d837bcbc5 SHA-1: d72680e1324b384d7265dc87535f3cce9c1724ae SHA-256: 776d65c251b13d269204698c6549139a99945bc86a13bb41e161a5020382ced5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, with one URL specifically mentioning 'highly compressed ppsspp games under 100mb' as a lure. The presence of multiple PDF link farm heuristics and a download button lure further supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://savaksangida.com/resimler/files/7055950894.pdf In PDF document text
    • http://kipia-nn.ru/userfiles/file/62354094794.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/cjv355f9k0fb9cgjbqsanfjde3/nusodefa.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/24519439723.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/21597428539.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/17598848386.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/34334254975.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tujitojipozinebiveveje.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/4714959135.pdfIn PDF document text
    • http://ebus.cn/up_file/file/74244477440.pdfIn PDF document text
    • http://synhbio.com/upload/files/68146774871.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/fuzelelova.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/weseralerakisotobatog.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/41552596330.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/99091368211.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fupewin.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410ed0dc4ff---mazuvaniropevezuzozaxubo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/55236591654.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410db40d397---67276998333.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903064818.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/97034809565.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/11718073433.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c26983fac---bojinafu.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/jikibotirimewemov.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/75426083828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=highly+compressed+ppsspp+games+under+100mbPDF 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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 17464 bytes
SHA-256: 52a067521304766340dd1204d9a09ccf4e652d398152a8ee1e859b818e3c410f
font_01_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 11384 bytes
SHA-256: dec69bb20b3910e299b82dbc76492e7de321614d09c6851d8b41d6709b3426ba

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