Malicious PDF — malware analysis report

Static analysis result for SHA-256 6811fc0650035457…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 13:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 14a071df3fdfaa656e2da3b00233dd50 SHA-1: 72b617f5e529525e398568ba8ae674036a8766c6 SHA-256: 6811fc0650035457b55e44fded0e72d8c3477edf453aa736d241dff0047c7495
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristic firings indicate a pattern of directing users to potentially malicious content via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://beautyyaurient.com/editor_upload/file/97650341542.pdf In PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/besow.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kilogedodozejujeza.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1075aa2a90---43445082701.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/liropowobawexowusober.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/vibile.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/21198141865.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a6456150---92938891121.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/reratepu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720771aa430---37990868753.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/temazo.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/42032398852.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1610c31151841c---fevasaxivowofimutulekuba.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/44912309906.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/walitufaletekajolu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d252c80e---rewafategeb.pdfIn PDF document text
    • http://beateromer.com/bilder/file/kogetunami.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a665ab40a---rasalebexogezusor.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b37576ebb---xegugutovuxer.pdfIn PDF document text
    • http://open-call.fr/uploaded/files/fobikixobote.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/eepu3g1tma34826rhutkasg60v/44343200160.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/20783841876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ancient+rome+architecture+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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 17380 bytes
SHA-256: d9e3b500600aeb188bed9f4e33223ccbd624e25d61b78eadb748c1a0f359e015
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10752 bytes
SHA-256: 1e942ab774a90c7266a897eeff65e4bbf741eaadf2e55251986941c19dbf9dbe
font_02_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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