Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fbda5f71044424…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 08:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a67161f42de7406cd4ff1324958c7735 SHA-1: 7da8db309a227197805ae78eee9b578dab862d78 SHA-256: 58fbda5f71044424be211df2339bb23e05556d8678846bcb50996e8a927d682a
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/98604239286.pdf In PDF document text
    • http://driscollandgibson.com/images/edit_images/file/pifivalapa.pdfIn PDF document text
    • http://guitarenko.fr/img/files/67025114537.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/69948838303.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/tojesinumokozipuzisu.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210918094636.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/73547786922.pdfIn PDF document text
    • http://www.ezmoving.com/file/64085986887.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29873739175.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lelakelima.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/66191004688.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1cde92d8ff2ef3cb6eebcb9cdd56d23d/filarufozapavojuw.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210919071047.pdfIn PDF document text
    • https://orangerun.re/photo/files/baxogidazinimidigige.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/pexukoxiva.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135dedfb8323---zebowuvivezeperemeg.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/30942887496.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wojope.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8139acdd---43473916890.pdfIn PDF document text
    • https://tsolisp.com/files/file/86228768458.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/1422936536.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/tulozulavurafexufegoki.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/30906765422.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/ninarawijobowoziwijuzinis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+lucky+one+book+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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 19180 bytes
SHA-256: 29435380566c7e144262fca649973241291daad96f5b9414b1076adcf7fe4b1e
font_01_sfnt_off000116c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 10508 bytes
SHA-256: c74ab8f5ab61d5c7e3dfdbf418da8c4eaa650362e78e72ebf8d843246684d253
font_02_sfnt_off00012e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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