Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ee93bef724d437…

MALICIOUS

PDF

82.0 KB Created: 2021-08-25 23:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 993f2220e98fa75004468d6885f4ff4f SHA-1: e4bc1806460f4b6f70aebd59eba2e980fdffb6da SHA-256: 75ee93bef724d437198844d4eb7787f5b2a71105f3f8a747fa58d71e0b9fd230
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it uses XFA forms and functions as a link farm. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of XFA forms implies potential for embedded JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://pcserviszlin.cz/ckfinder/userfiles/files/95219397750.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/bawulapulonemubuxu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pexuzidesaz.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/68100181535.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/zozonovo.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/66220753557.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99230ade7---tikojexexiluxekunakijof.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1a20a094586bb1e60832b58a62354f4f/17716037744.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079d855204c2---kibopuxewododumelumukudop.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p46qijrhihomq1s16l8f63jiqv/ruzoxuko.pdfIn PDF document text
    • https://jobtiara.com/files/files/50007284816.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/rulowu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/kiwodaduz.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/zedakasomidoda.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/dodaze.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xagesosazimezumode.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/57368474559.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/u6v9a54ec7ukfl1fh11cbescg0/lobixikuzozusax.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827d5521dc6---renakukuze.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/37596376287.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/12700955216.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37b59389f---tebuw.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adff38804cb---27601409027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=surface+roughness+produced+by+different+manufacturing+processPDF 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_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 15780 bytes
SHA-256: c9446c6d41433eb302a28efb8a5d14728efe9ee08fe23bd8d8b36d636fd857b6
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 11448 bytes
SHA-256: 80c55eb99dac2737474fc010556e0fd0f8a19a3db72ab3e60731a21b63adc506

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