Malicious PDF — malware analysis report

Static analysis result for SHA-256 4688aeff9a441043…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 17:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cce86fd32357da58763455e0d6e6b29 SHA-1: 5b54ff606bfe561df833a437ac0fbaf8d3050307 SHA-256: 4688aeff9a44104371c806134a494a7758fce3b29a995d3fde8f844ac364ed9c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cornwallstaffagency.com/userfiles/file/lusujowudufo.pdf In PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/60654609959.pdfIn PDF document text
    • https://areicon.com/images/file/nefufixusit.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/25929789502.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fad5721f2de---96160557714.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c43ffb8b7f62bac1ff450ba9c1ecff75/gevevipakirororofub.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984328779b9---94213077391.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ba7a1ab90949c0009fa0da7045848902/gibapiwakubuwi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/55520267565.pdfIn PDF document text
    • http://iltorg.ru/upload/file/98083959978.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e482aef85d---pedobim.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/90626871965.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/55240988376.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vanapatubabe.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/sasozadekudeberebodizomun.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed122f3a2---20382912086.pdfIn PDF document text
    • https://fototipia.hu/files/files/45049041130.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b987f864bda---66222654857.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e3029d3778b1504edfb52ebb1bc3fcbe/bewofovinufokubag.pdfIn PDF document text
    • http://etre-belle.su/images/file/11500733018.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/87230098828.pdfIn PDF document text
    • http://domario.ru/userfiles/file/voxudoguzubotisolen.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0c8b4c989d568f3021494d361392f19e/muwojulopirijifodupok.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/cec48fa0bc1fe85eab92ac25f77db6a1/80122148399.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/e3b09d7e7132cd00c7c96fae497dfff2/puzogagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=genese+espiritismo+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 18856 bytes
SHA-256: 8542e232ba2a8b73761a99431c896655167c76cd5fdfbc9ae205c9852c226c2b
font_01_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 10492 bytes
SHA-256: d6825be4f5b736254f50c7448009536a5a8cdbeacca20a16b97e169487585d46