Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d723e3c5c6b2db9…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 19:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a4cbcbee80d83e956130f3c52c27ccd SHA-1: 89fe0972e68090f274f40caf273b0a8cc7740c14 SHA-256: 8d723e3c5c6b2db92a7cf1bbde866e94cf58260c760bb031c4517e8ad9797060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though obfuscated, further supports the malicious intent of executing code or facilitating redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://benardoutlite.com/admin/fckeditor/fckdata/file/vepufiwowadixa.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3voss4d07lip6vhinuj7kjlcq0/79042523630.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j6jfg7194cj9k385bge8f84tp5/wilekafipikanedumujusa.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/birefelupebu.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/fdaaf0dc480c9a50571883f7693d839a/44901654548.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/digunopur.pdfIn PDF document text
    • http://zuche0551.com/upload/file/67585447122.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wusivipemexuvariwugetul.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/13/12087106124.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160758bfb47986---bodamem.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/pivasibalimizijeg.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/add8e89f8a04dc2af75758a5e1f9cfed/98045113809.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbfb746c55---nugegesipujagapixe.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xozojexe.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/3706613645.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/57910710097.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/rodetagipon.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/183f3abbce815468e0b0ab6f2d9d8f47/zidagikodowovel.pdfIn PDF document text
    • http://bjjiffy.com/upload/pagadagose.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/62208033261.pdfIn PDF document text
    • https://curvy.tw/upload/files/buzufuzisovamijibixaweg.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gj74bd177i4iotbev4f210gsti/13880532734.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49117ceed---96923788707.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0ec20c4b2---jitabuduvuposunutigosepal.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161045cdbe3c6e---tiveminanupozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+de+instrucciones+pava+electrica+atma+pe5900nPDF 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_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 18904 bytes
SHA-256: 1844f04c73a725b4699da704aacfe8d313e78bc4ceeeb0249a2d2be69187ef79
font_01_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 11256 bytes
SHA-256: 4773411f4a98b85b4df9037af908ff26d33bce95a269b7de30f5e94fcb6e0c23