Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fed3f57f7adf24…

MALICIOUS

PDF

112.4 KB Created: 2021-08-02 02:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02a2ddb343ec370967a5cd4418cbad6c SHA-1: e74ad5ea53e9bcfba5c7ad8fac9b8d4b14a8b747 SHA-256: d5fed3f57f7adf244c1dffba2d6e5c70162a82dd2f58848ca54247c804622543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbb7ab12f4---gekadixugot.pdf In PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97010029724.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/nuturonutudufukalalili.pdfIn PDF document text
    • http://geose.ru/userfiles/file/66986283995.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/39926893811.pdfIn PDF document text
    • http://tianfonmm.com/d/files/922764144.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pcmo5bbiqmrlr2l9rm840qih15/74157391726.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fadafff3feffc39340b5eb9f492a3aba/32555146122.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5gk4ce7qvn74u3csn209gt9nh7/vupomotugumurajagevar.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/buwosipufolunisedovetofod.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c9a7cd52f---38915766292.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4a782e59---46856667958.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202174648285692.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/57295323465.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/48882408178.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/07adaa1e15bb00966b21131531dc35b9/vevezalogitenunil.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/152c2d9ff6f3760a55de0fe135bb18f1/tuzavijaf.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/dosofugesuk.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/83937109719.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/25219792263.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-18/20210718055757222008.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/al8r1ha5dobjtnvkthjqeoutag/82717935484.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/4c44fe67cb78b76feb2ae650d990d2a1/remipopexakixovawogeliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bollinger+on+bollinger+bands+by+john+bollingerPDF 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_off00015399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15399 17992 bytes
SHA-256: bd213296b2ae4331f4f9a9655a07ed8873c2a62168279aeb0086db78a4bb1720
font_01_sfnt_off0001823f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1823F 10864 bytes
SHA-256: f5ab68b7ad244a54932752255beb3a96969311342c8d18da9445f33fc7cebc78
font_02_sfnt_off00019b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1