Malicious PDF — malware analysis report

Static analysis result for SHA-256 7832f1ddc943c812…

MALICIOUS

PDF

197.2 KB Created: 2021-08-17 16:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d1e34afd92f02479370e317f994ba88 SHA-1: 98bbd62fac55c04f0e042dcb912a105c9e5e8c28 SHA-256: 7832f1ddc943c812b89a1e07e9dde7e3ae9e338b65fa42d3e27523fa8a5b6b7a
126 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, specifically within upload directories, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier flagging indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7802

Heuristics 5

  • 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.
  • 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://helder-effect.nl/userfiles/file/34034998939.pdf In PDF document text
    • http://abworder.com/uploads/files/xigizi.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/wixoxogitaruxozu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/18160299383.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d6702e8db5e5528fb30c0cf311217af1/tedekaxidanetogosi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/59714389580.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/392uk9nfep2ggsu3db960o1aav/duxan.pdfIn PDF document text
    • http://unsersohn.ch/images/file/79909135508.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/silitajiganenezakuzalu.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ei2ii2vqvot4n1qkvoqldgvf4o/75764453871.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b343779702---vijiba.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/55340007928.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f5dc4e41---kujojefukoxogejimiwimaw.pdfIn PDF document text
    • http://cy2hand.com/userfiles/papupowagizagitutodaxar.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/papelizupeza.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pozob.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/22e672054942052953229a2a1c8f37eb/76808163096.pdfIn PDF document text
    • https://wagaskar.com/media/zigojixugijuziwabasawex.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/9059441481.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/koxozov.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ee6616fed7fb708df0414c6dc96fe4f3/kelasifomerixoxa.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/691fca2a17d026220728c0a1ff0b395c/95300163593.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2c1c95437739f7e9039d21f48c9e0498/11913904033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=un+peque%C3%B1o+empujon+pdf+descargar+gratisPDF 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_off0002a12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002b942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B942 11504 bytes
SHA-256: c0cd38441d1d6fcf8eb55be4e16548f1c7fef68b36b3e67dd88322488b4286aa
font_02_sfnt_off0002d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3AB 18452 bytes
SHA-256: 12dd714a3de5a1d45192891d2ef92977aae88a9708498ae9c21fe35722bcaf19