Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7baad494fc1c91b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 19:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1c19c62f81ab40757a57f7e7d4a53e6 SHA-1: b4d0227f85e8ff52798e096af80b3db158347ccc SHA-256: f7baad494fc1c91b013bd11296811397d25e9ec231d698e9040ad72930b22506
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised or disposable domains, designed to redirect users to other potentially malicious PDF files. The document body is heavily obfuscated and appears to be malformed, likely due to the PDF generation tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/43923068896.pdf In PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/bokugebasu.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/70604364604.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/89940322009.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/45580258752.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/dolositerazarilajajig.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lubadasiledikapum.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/81773430919.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jitenabavafaraxorem.pdfIn PDF document text
    • https://ekransamara.ru/files/22018779232.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/botus.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/11755251859.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/regezamuzevuzisuxaxekiven.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumazovezexo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/db75f53cc4d6547c1186609ada38f3f9/nunejokaxajewetizipugi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161319f332483d---11122690907.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/sabuwifulerivafefaled.pdfIn PDF document text
    • http://letdentalab.com/img/files/60896843792.pdfIn PDF document text
    • https://jagominum.com/contents/files/62945409652.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/viu0lso7kkv6vakpgu2vv85l3a/zamimojakuzodud.pdfIn PDF document text
    • http://mutitar.com/user_img/files/89651501828.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/74562083372.pdfIn PDF document text
    • http://sro52.ru/uploads/files/daxib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tv+tokyo+borutoPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8990582528.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_off0000b5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E9 15848 bytes
SHA-256: 05e3874bdee9d377b1ed98c8061bec62ee6674f5337597fda2a5f56437aa8f6e
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 9872 bytes
SHA-256: bcd618b7ee508b43f742952e5d21207e61e0a1bd01f55f487569b9e47c44154d