Malicious PDF — malware analysis report

Static analysis result for SHA-256 b514d329e9cf3f48…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 22:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2308c6dab72bf1ce47aebe073ed3c343 SHA-1: 9f26e5d0fc528db7e1b2725590f05b766e362a27 SHA-256: b514d329e9cf3f48722879f837bf98f99247efbf8a646c9b5c93a06d0990143d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=portrait+of+an+artist+as+a+young+man+pdf PDF link annotation
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/kadijukuzi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/90058471361360113579f0.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/purozulajinivozadopijag.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rolapofef.pdfIn PDF document text
    • http://consade.com/userfiles/file/kanaxiso.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/72544308671.pdfIn PDF document text
    • http://medica-brno.com/files/915443725.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e56a600f9---jofasodaku.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0i1f62cmkibdqtlnjkq6d1ch7g/mazewukuvabulalipa.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/59953685454.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/bafemewatimudesar.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/25367741135.pdfIn PDF document text
    • http://methese.com/upload/files/zumamewewubuvo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4b6757ba---rojexetezixatorelefodat.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393094cf69c---29570770793.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/wafikepifa.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/40546064267.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/vikezazifirimu.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/66433178844.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/mefajoxufajox.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138789db122a---97398303741.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_F1D0D1BD7AC6BEE4.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/52092442269.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/nosusenabetoxavusiteje.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_off0000bc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0D 10876 bytes
SHA-256: a607a4428d186b45ca73eba512ef634b252429aa0177ffdc6d5c7dce506f2790
font_01_sfnt_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 16884 bytes
SHA-256: 391678c33bdab1df9ef5a77f8fff133207de027ed3be02ee41c8be858e6e8573

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