Malicious PDF — malware analysis report

Static analysis result for SHA-256 64558f396b24dcd1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 18:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13af34991a2973683169419e87f27166 SHA-1: 47a8d1a9ff4fdf4e3d4fecdcee52670ea8ec2faa SHA-256: 64558f396b24dcd1eb539ef6de33241812307dad7c1c1bbb8ae690ea72bf5157
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to prompt the user to install a browser extension or update. This likely serves as a method to deliver a second-stage payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+block+lazada+ads+android PDF link annotation
    • https://cbconsulting112.ca/userfiles/files/78938903542.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/043h9bnjae4kh333tgj4n1j9v2/3838185876.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/26027569045.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210911100244.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2c82c078ea41166ca4260499cc33dfe1/tajimakat.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/8503107428.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zodasefawutaverukodoki.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/xisojifuni.pdfIn PDF document text
    • http://vln.nl/files/file/kibigifev.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/88394476585.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/51063893019.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zukakudanumalabakanuj.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613389034b6cb---kunusonifapem.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/27744692845.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/takewijulesuroto.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/dudobekukebexikap.pdfIn PDF document text
    • http://starma.pl/files/file/63481367824.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f511764c1a---burasijagudidodegewexanez.pdfIn PDF document text
    • http://exosushi.com/uploads/files/50095404254.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/buvow.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e783d716---66661967820.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/14681319887.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/65438265280.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/wimuli.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/34116341030.pdfIn PDF document text
    • http://szpk.hu/_user/file/63087206478.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_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 18356 bytes
SHA-256: 44ce9afb87b403f06071cccc8083b9427d57a07d8440e8381cf111a6e9b6d1e4
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 10600 bytes
SHA-256: 67383aef94aeac96c71594e40d3fd4beb0b7eaee5af03739f5fd3856a99e8c0a
font_02_sfnt_off00012578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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