Malicious PDF — malware analysis report

Static analysis result for SHA-256 866d790c87431f06…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 00:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 56472ceeff9a9abb756a26b7fb815213 SHA-1: f26cbb5fd8fcc4cfb4cc8fdb40d6d401d94b47f3 SHA-256: 866d790c87431f067cdb32a464f00e094f6496c52b5411e5fac83bedc48a14db
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a lure for browser extension/update installation and potentially a password-protected archive handoff. Numerous URLs are present, many hosted on compromised CMS upload directories, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/accafceba60059903757ee1650cbf5c3/kogodetimunafuxowudixumof.pdf In PDF document text
    • http://venusland.vn/app/webroot/img/files/xebuwilariz.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/4446118626.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/041a99b4085eb99c105c43c64f9dbe91/zibowixesif.pdfIn PDF document text
    • https://dhesient.com/media/5895343015.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073703fb55d7---zuripedupijufiti.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/69585704699.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e239acca78e3d2cd9f6249387a8551c9/vuzexeraburinoxuvisuputa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160887ae89e659---85613227438.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/juvenenowanimirogaz.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828cf8f0590---tidewafiwi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bd2f140d7327fcb6274c1840408c1a65/68191134552.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f8cb839---16478661407.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9dbf2c34---38018477705.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d46d8152a751d1787b3819c3c859e9c5/78286197473.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kevipiberumugugijizox.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/mjnjog40g9s663or0t2pfc48pj/98571133636.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/51935733790.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/84881007005.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b0871e33---84186851552.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/gimevuzuledazawalawot.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/673624ac7d0c6fa6584d236eb0dc751c/xogifa.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e3dd5dhntip25lvs59g4m3d2j2/furavafepufax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+put+different+pdf+files+in+one+pdf+filePDF 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_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 10508 bytes
SHA-256: 5218c531fdf45c6bc4759ffa89ee8f74777035ab94e54c3b49e76a8a4f93bd83
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 16408 bytes
SHA-256: 6bcd2ff698f0a94094c1f2f2bfa965c431b61ab2b9557ff70872fa0b2a740c7f

Open this report in the interactive analyzer, or submit your own file for analysis.