Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd6cd4228d98b2b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 00:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 539bacc37fde4322b78e19e7a302f389 SHA-1: 280aea59f5272aac388ce3d55f9adebf6ee86886 SHA-256: 1fd6cd4228d98b2b44f8cd45fa2251ebd343f05b551836c941aa4646751d28bb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains embedded JavaScript and presents a social-engineering lure to install a browser extension or update. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the numerous external URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, aligning with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=urology+secrets+pdf PDF link annotation
    • http://contrast.no/ckfinder/userfiles/files/giputizifozomalama.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6cc094de---45344818386.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b797b504c---tixazo.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/47120247647.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/fuvimegidipokus.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa459b5a5---dolefabudigimafomuxaw.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/45997486811.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/85953674116.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e1a28c32---xuzizira.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/xugajoxalifezuw.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3845d7f748---58722285684.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a1ed0636b66590c3783b4342476c6f0d/dotuboxomapasa.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/90051657129.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/m1n09g8qtvms2ldrti3t7s3ufk/77515566482.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/99703167443.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/48420903059.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/46805385500.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/ripaturogodetopowukid.pdfIn PDF document text
    • http://goref.ru/files/file/wimudil.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9906e5c8---mibufajomuzaxunoku.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/21b7205f00dc39e8cc86a756a2bbd213/giranojuromijatodewuda.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8414287175---4994763548.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/sumaponopuwipak.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8pocn43d25e2g428i73osshsg4/loganufuf.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4a56a5e5c6a1d152e989fc8af0ff466d/71509948158.pdfIn PDF document text
    • http://flomojapan.com/upload/files/59181186592.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609122b9d2270---51319227800.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/48695473764.pdfIn PDF document text
    • 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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 17820 bytes
SHA-256: 8c3d814569dbaa36ea9cd75f7cde13eaaa9164a11817a98f43d3bfa7bf3a2c33
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 10556 bytes
SHA-256: 1a02f028f20fc04b17be5e48e419a2120332a10180a5b813aea71db50be2286b
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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