Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd7d69b23899333…

MALICIOUS

PDF

76.5 KB Created: 2021-09-28 14:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c2542ff8573c63eb89d7e63b8745f8ad SHA-1: cc25b48e8c3311edd98b4965084b44ffbac8c3d7 SHA-256: 3cd7d69b238993336a9415a2e12b8011fdf0a1e5cbc6f851cbd3b0d1b7c5ae0e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm pointing to potentially compromised or disposable hosting. The ML classifier strongly indicates maliciousness. The primary attack pattern observed is the use of a link farm to redirect users, likely as a lure or for SEO poisoning, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=anany+levitin+design+and+analysis+of+algorithms+pdf PDF link annotation
    • https://rugsinc.in/UserFiles/files/12388405734.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xixiramibixiwewifa.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/21300170634.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/1165924574.pdfIn PDF document text
    • https://camelcarpet.org/d/files/lexonugatifix.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/11753673141.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/38065628983.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/risipimebunuv.pdfIn PDF document text
    • http://belniig.by/public/file/ruwefa.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/zapaso.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/piwituvugujumimum.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/1nd8p1t3f8j8og0nqhvgraeu72/91745399095.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/tasekareboj.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/bewuxiridedejuragozijuweg.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/16276175687.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/zufiga.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/243cb292199452eca8330706645c1386/vejutekuxomapobevajunid.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/jumenanogemaxejedutug.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/31657666679.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/79020930284.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e0bc1118---dozibasufixotafuv.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/guxoxewejefujowagiziga.pdfIn PDF document text
    • https://shinaltd.ru/images/file/1649536013.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dbc81b4e7---gibamiz.pdfIn PDF document text
    • 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_off0000bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 11108 bytes
SHA-256: bc840c58cf8ba06847886d384a354f7b1981a33aa1f9eff1771da13f437e1918
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 19312 bytes
SHA-256: f41396a253ecf976c51131e67128af87ad988d0ffb3336fa0d63823d1c5da4bc
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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