Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29638f3bc749eda…

MALICIOUS

PDF

86.6 KB Created: 2021-07-17 18:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82805354d36f6486c2c8b64cd5ddcced SHA-1: 0766335eef21cb3007ffc892cf9b04d08b79fd11 SHA-256: b29638f3bc749eda2c78122059ebb19c5e827a2290a0f3273cb556ab52e2f11a
164 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The document's structure and numerous external links suggest it's designed to lead users away from the initial document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://tekstilkentrehber.com/upload/ckfinder/files/43709104259.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075e98e1c609---gejazopewomiwajubuzuga.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d76b010c---kamepujetipipenigevazo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b165ef986---9164911291.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/39738781923.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/juvoluxabazanomi.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/lazoxazikibakudu.pdfIn PDF document text
    • http://yilip.net/userData/board/file/70346372199.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/26320958208.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/00096ed7bc5e8d18786287c4ce786263/82928732098.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8f4415d1---23449245386.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa496e7c98---85740134151.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/mebusolalibujoliwewoj.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/81018741483.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/73vofka65l7dc9431ep5p22taa/38111646117.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210617082206.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwabasolo.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/75919715239.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/03f4ff9036e421a98087de7d520a071e/48856255332.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a901fd76---lunas.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/patopezibuzoxisadal.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/popibaju.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078159e028d3---lapatadozixeloxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+tangible+net+worth+from+balance+sheetPDF 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_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 11140 bytes
SHA-256: 4a6af2c4dd401271cbe2149e8c61b12a8dae64c6dafebe6e880cefcb21701eaa
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 17000 bytes
SHA-256: 550b42c92c54b5bf140d7ac0a187cda2abe33621e6cb8c8e140a7745e4220c8a

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