Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb05fa4a5d779fd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 12:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73aeede6f690da907628845ec822c9cf SHA-1: 02aa8656de5903927f4af1cc1e866e835c10ff29 SHA-256: 2bb05fa4a5d779fdc39a495cb9808f8b72e200a8cd095c1049830f0a07c2ba4b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=lz+play+apk PDF link annotation
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/fivuzo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/13324062175.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/kofomosoxobip.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/78658272752.pdfIn PDF document text
    • http://state-lithium.com/upload/files/56141510424.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dawaxe.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/zariro.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/bifedagilavomi.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/86598540395.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/toxaz.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zubisulizawoj.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c49891fee4---82695726107.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/faxanusinuzul.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/389249214bd4595d77aa8a643666b164/puwulamojaduvukevajif.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/sijapasa.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/jononuwev.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/dopemesojizi.pdfIn PDF document text
    • https://etadelloro.it/images/file/seguxogog.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/12537914532.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/fusazigazebem.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/59476081026.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/31be303be77f89ed54921dcdb5553de4/48210256855.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210901185316.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/1337299874.pdfIn PDF document text
    • http://chinahongji.com/d/files/35946277623.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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 18848 bytes
SHA-256: 14c61f955fbc9cf718b15e0a4ebdfeb2f7760e41f85db7bfa5dea82aa2c28c31
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 9652 bytes
SHA-256: 779168011da04fe723ffdbeb84b4582b947a9fa555145ec952df688698649484