Malicious PDF — malware analysis report

Static analysis result for SHA-256 0535d06fde4a1a8e…

MALICIOUS

PDF

102.4 KB Created: 2021-06-28 10:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40e54efeecd6ae6bbf638723a82ac5ee SHA-1: 1dd0b4c7354448caa5dd83ed3cc623c07cd3734f SHA-256: 0535d06fde4a1a8e15493d536fb9be60d27e3c8301734da5d6e8852443726e01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://greenbrier101.com/userimages/37718953261.pdf
    • https://sportsht.com/userfiles/file/logemokokababosojivoxa.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6usbk7qkudc7i868redotgik2o/tolixumafiwutexi.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/76204022783.pdf
    • http://mynigaoe.com/upload/file/20210517123111.pdf
    • http://adamlegal.com/userfiles/file/56464719679.pdf
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/towaxugigezafes.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/5f3cdc485a684b2c63a4dd600a18e299/76668745300.pdf
    • http://seoulmenu.com/uploads/files/rikil.pdf
    • http://seoulgreeter.com/userData/board/file/witafizewosabaru.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ecie97fbuq76f0cr862bi83bl6/68850714200.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/55279710924.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e22ed8c1---widivuwuboxa.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/018ee3ada88e847e9b8285d28fcde549/dajorekawufibi.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9df24e450aa83bca27d1396f74cf478d/74023727243.pdf
    • http://4bx.pl/public/file/81328944121.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/70g49q07n1le27c57ar2fiin93/18663452342.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9932b3ecb---23175433997.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89241a238---63864962837.pdf
    • https://hinodanang.com/uploads/image/files/27698951653.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+heck+was+that
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000121bf.bin
cc106ffe4a70c8e1d424d02b9fdeef269ed593b6c1266677889e7d8bc20355b2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x121BF 24280 bytes
font_00_sfnt_off0000da28.bin
862ab37542254b54ecd2c5e9241ea5cac853b3bb2ea2be264c9af0e758550aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 18996 bytes
font_01_sfnt_off00010b49.bin
75bd1d5a60816f364ce84fc1b0c64cd53a70f03708f2472473593f0dc554d15b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 10004 bytes
font_03_sfnt_off00014d31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D31 16792 bytes
font_04_sfnt_off0001653f.bin
8b5571bf2a0cc8b647aac6be30832d8fc812605938593e73f05dd5c159326e94
pdf-font-stream PDF embedded font (sfnt) at offset 0x1653F 10612 bytes