Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4e3de1234527be…

MALICIOUS

PDF

77.9 KB Created: 2021-07-19 10:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c506093eee5e3806c2c8e019b8fd42c SHA-1: 33f7e1df76ecdbe699e0e449b3211e2e8378bde2 SHA-256: fb4e3de1234527bea813e69ed5e76524574ad9e7fad9fc593aadeeaba1fc548a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF files hosted on various domains points towards an attempt to obscure the ultimate malicious destination or to spread content across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://orchid-daikanyama.com/userfiles/file/kewawawubiroxudek.pdf In PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/6819154895.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a62b2ed3bc---45175470665.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afff02bfb---nusilipinedalewadagep.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/kusetigufawisidez.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/61963101021.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/febebirunofolopufodabi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3d0176bc08f8e9bedd4b277b4358904b/13527924403.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a8a15770---gimidexoguzirojovexefog.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/busoxoru.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/favigavefiziluregijeg.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/66691183022.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0048cade75---41047715569.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/88554776035.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/lenavijidowotofanarefuf.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/62bedd2cb2b18d18d62a08ca15047915/19602784727.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/84053048643.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b762458e6c57324d5f3a8dc8b11fd409/34775002196.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928764719f0---79237368021.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/fufudipebug.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ams2onv1o0iq9d9humtp12u67/venizugixo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/538e1abb39ae8749b3313e15782b493a/logiwukifusotibusosex.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca984073e5---87631818775.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/dofupavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=parts+of+speech+exercises+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_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 10860 bytes
SHA-256: 2a05b7c6a00a48822f7dd2275ddd905ba5964e7c69e03ee95881813567b137d4
font_01_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16576 bytes
SHA-256: 0337d9c655e8c5dff36a00a25e9bda587fe68e6ebea6ee3ec86c3e991808623f
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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