Malicious PDF — malware analysis report

Static analysis result for SHA-256 873394dbc18bcd3b…

MALICIOUS

PDF

75.3 KB Created: 2021-10-07 02:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 21bbf3539f1aacc7091bd5a3d19ce5b5 SHA-1: 2df1f5f29fbd4a966de0960ac818885508c55392 SHA-256: 873394dbc18bcd3b5ad3a6a840b19cf670fe9cdfb58ee1fc7ef66d06ddf38287
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically classifying it as phishing or a trojan. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://southafricapools.com/contents/files/saperejawobumuvekitafa.pdf In PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/junipenatugawidan.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/31510713870.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/tonamugafofedarimaxepeg.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/90773907615.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/fevefu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4496d0e71d78325b20decd5f0799b5b7/61063277733.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/bisujafil.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161464a7f40949---38731585476.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f11d087acb---78547402932.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/90044441384.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/gawurazitunikabojosak.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/nagudopezadilejelatoxu.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wosuto.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/farizu.pdfIn PDF document text
    • http://15881588.com/ckupload/files/kajoxekazigufifof.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16156091c1d0b9---nudojibup.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/5116949431.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6d253c5e8a2b2f7a8764354ffd039790/dirokedikiritun.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/dufota.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/73508109440.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16150a85f43eb0---batuzuv.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/91045190349.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/5212584476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=justin+bieber+lonely+mp3+download+tubidyPDF 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_off0000bfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCC 11156 bytes
SHA-256: 689aba915b60935358a9859420357c9399af5f3af30669bc7d7e8c26475a69c9
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 17600 bytes
SHA-256: dff05ec902763b72ac540488eca77c5030406bcdcfa0951b77ef335627576b0f
font_02_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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