Malicious PDF — malware analysis report

Static analysis result for SHA-256 f282135052f7b289…

MALICIOUS

PDF

98.1 KB Created: 2021-08-11 05:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e362702c82ce37ca1a8955e04c0828f SHA-1: 0338fe9b0116f2ad473ca36ce0563009e60c02b4 SHA-256: f282135052f7b289db789ca2e7c656e8aa06cd48ba040475828cf557f5101e34
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The PDF structure and embedded links indicate an attempt to redirect users to external malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=how+covid+19+affects+the+students PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609562baf08d6---kojut.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/62a24dc79e1f2664f6ddb162cfdca2d2/dejabijoxesib.pdfIn PDF document text
    • http://www.bash.cl/media/file/mapomusu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f67ce3f867a76f8fbdc545f5a4c2c320/57551405682.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6e3624894---94193125694.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/093bd76a55aeca55c17353b2fbd6ea20/7814071442.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/73400301134.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/87421111184.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/fopuzeganorututemososepo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161117e6cd2b7b---19642550347.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-29/20210529032023567142.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/pudujavutapur.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/40258939350.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b620ad6a5fd---winebetivokab.pdfIn PDF document text
    • https://isosklo.cz./uploads/33453080542.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075040ee943f---98021108060.pdfIn PDF document text
    • http://fabtur.ru/upload/files/42799654570.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/14172797344.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d473fb833e7---25378935926.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/nelesimed.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sugubavesemuxatojajori.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6c3b072e7b8e05903b981e75812fd0ca/94892106341.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/nimazelewiraboz.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/93357598886.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 10888 bytes
SHA-256: 4ae7c6e11ae00ac7c6cca7984398805d47ae78822ce5f8df0aeba9a9b6d83637
font_01_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 17132 bytes
SHA-256: 752526dd899bf4e3d2d816c881acce607d7c12df4edfc43014525062f7692d59
font_02_sfnt_off00016180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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