Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1791c7d974004…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 00:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5ee12c84596214234e4d885417a4c28 SHA-1: 777391779691f9cc9bd82928479d4d98116ebb15 SHA-256: c4d1791c7d974004eddba69b5ebdedd482694c13bca605a9fa19b9b03d108b2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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 http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/lolaxi.pdf In PDF document text
    • http://capmar.eu/userfiles/file/9339042843.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lekotanur.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5g804gam2uk9u8khn3llfnnah0/wetojaveb.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/79985319943.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/fuzufuneriju.pdfIn PDF document text
    • http://coffee33.ru/archive/file/75986459580.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/paraw.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lb187hq6k2ij6bb1jmvoujv4hj/88864538093.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/35152353590.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0fc5afb3---86285913198.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/64830272193.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b56d92d7e---puzisevasovajijavosafot.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/22193209084.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/661c9crio98qvo13lobvmfqtfo/pisikiriwalufal.pdfIn PDF document text
    • https://paperland.bg/uploads/file/zomuvovimuk.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/vavokimibom.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/pezez.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65af80ab9---91933582588.pdfIn PDF document text
    • http://greenld.com/userfiles/fatubamuriboragikelod.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2e9e1dffbc74617b00c77bff67f8588c/dufawuvitewuvud.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/20101353557.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/wixoloriwet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=speech+marks+worksheets+with+answers+pdfPDF 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 18088 bytes
SHA-256: 7110ae22aa4e93dbad796df5d0c76c7fddf71a8f655aba7eba2c412c2390613b
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 11092 bytes
SHA-256: 388b9b488b9f02b3c42054621525a8b5bdf276c43a22d03dd3d8b3e909ea99b7

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