Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e475d6cad8f8348…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 08:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fa1279f1fc98615bd0e587ababf6984 SHA-1: fea35b14e9f707cfc60e5dbd2ae1eb2cd775b305 SHA-256: 8e475d6cad8f8348bc9bdc7d3be40af553c814f7f5c3dd582296c0e392a4c3d4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly suggest an attempt to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://krisoc.ru/uplcv?utm_term=apk+dragon+quest+8 PDF link annotation
    • http://hoangle.vn/uploads/userfiles/file/84622431931.pdfIn PDF document text
    • http://airmon.hu/images/files/fawipifadoteralo.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/zajixavo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/30c10e515b5e053f1627907d3bcc308f/mozedixawiku.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/97414917529be696a693faf9880e2fa7/turonuweredufu.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/58458501732.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161410344bbe0b---rotikuputikerubasaxivaxek.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/67136589953.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/ranamurexa.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/samunesusulanukobaxigis.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/nuzusomuvosidunijuregev.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/jiguvamogodujejidi.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/molarujeze.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/21303984063.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/finidomebegifomemew.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/rawulowaluvafoxafirasimeb.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/12192304541.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/33611677944.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/sizapudaput.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ba588549a6282e800d8826847ad04736/41982787814.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6542455e9c4a9e9ca39e0f27c23a840c/92785049284.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zirasuseke.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd8b65647---49308861407.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dajuvo.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10956 bytes
SHA-256: 1d65cac0677791b69f14c3c1c02b8d4bd7f1c0f2d5554cf863dfd0d45d411749
font_03_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 21588 bytes
SHA-256: df628ea12a9c9c7f22c1fc452e529ea6a08498c4b8fff7dc7fc6faf7a952f3c0

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