Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f3c8aedb398c75…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 08:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b63e9f0c298291b0a1527709ae85a640 SHA-1: 0449fedd81a0af9c2a0400f0c3a493afb8eb9e6c SHA-256: b1f3c8aedb398c75c4b2e669b2dd46dde4da6bdfa60f1c27d375ed07e8329c56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on potentially compromised websites, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or visiting phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/10794017993.pdf In PDF document text
    • https://ajur.rest/uploads/userfiles/file/2601764595.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6526c849caad4a9afe6bfb83b7f8d996/82608950517.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/82869839812.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e7f98727---10623272464.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/87778496068.pdfIn PDF document text
    • https://securitydm.com/slicice/file/95060196449.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/3244132578.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162337501493.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4cd8ee9575e88c9dd43d42fb86977d2d/74070139809.pdfIn PDF document text
    • http://gibisch.org/files/files/kolovevesozebularewivu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087744297450---nigudodopulopifanimu.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fatej.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1b99af7d1254580e3ca0db6f748bd7bc/75106718340.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/16517379270.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/58666530069.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/76874227978.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6678c0f2---57081573736.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6934fb39072ea34e99c674569f7df252/55553255620.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/66971685401.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e087c442700---tevet.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d9400c91---76961391197.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/gelebizudimumerarofavigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=antenna+and+wave+propagation+book+pdf+free+downloadPDF 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_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 17800 bytes
SHA-256: 70604208507a8e2614823332d2d5706a028f86f5df6a6afaab3e2fc5f42ac2c3
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10868 bytes
SHA-256: c4d08116bd27f9f0ec75a671a0c64b07b9f060af27afb6e09e77722380dd5b03

Open this report in the interactive analyzer, or submit your own file for analysis.