Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b51ed44290ffe6…

MALICIOUS

PDF

198.0 KB Created: 2021-09-03 03:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 848f2a78e41143429f787810b9b3bdc8 SHA-1: bf1c216b99319605ae40f0efca0dfd0fa8030c5e SHA-256: 82b51ed44290ffe6db37b508704d629a9ff2356c5c9eda175ff237e652e168e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of numerous links pointing to compromised WordPress upload directories suggests an attempt to distribute malicious files. The document body is unreadable, but the overall structure and linked URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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://gdlianyu.com/uploadfiles/file/55263441285.pdf In PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108110824498335.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/80766904576.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/fimozoxusa.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/aef127ad11e4179468984cad9060ec03/49951226404.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/88167454803.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/84647257804.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wifofoworepulutezoga.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3caa89cd9---waxawozesolagukokixuzor.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/45048747930.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c18d05eb4---57298394666.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/faxizezujav.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/bixesowemugafezimajososam.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3i76aho5kod487eoukijoqehli/20788405619.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/6241295356.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/rexasub.pdfIn PDF document text
    • http://pedraferro.com/files/files/62496692819.pdfIn PDF document text
    • http://specimport.by/files/files/komemi.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/jutowisobezomorokikemo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc16805b67b---35783880373.pdfIn PDF document text
    • http://scpt.it/userfiles/files/pirof.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pr6vjvr02gto2udh6jm77ham5p/11805174241.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87acbd9aff---vizotulafu.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/582035726.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/16522777700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=xerox+phaser+6510+manual+espa%C3%B1olPDF 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_off0002a281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A281 11220 bytes
SHA-256: 2b296b7d3b512e512ed5e25efbc5558d6ffed899470d63cc5688ba5cddfa33d0
font_01_sfnt_off0002bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D47B 19284 bytes
SHA-256: acc8e524a130a3652a9e6f47626048694da36ba8f4f5354b6aa413bc6c506ac9