Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6361a2e40223689…

MALICIOUS

PDF

81.7 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: 7894d4cfb0f5e38d6f7dbea23625934f SHA-1: 1064ebb1bcce8b846cbb0c4827593b55427f0747 SHA-256: e6361a2e40223689d5c16975186fa8187263fc48a7021de1f3494a3b8daed1ed
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser extension or update. The numerous embedded URLs, many hosted on compromised or disposable domains, likely serve as download locations for malicious payloads or phishing sites. No scripts were extracted, but the overall pattern points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://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

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