Malicious PDF — malware analysis report

Static analysis result for SHA-256 103dc78b87698f62…

MALICIOUS

PDF

64.0 KB Created: 2021-09-09 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fbf90604bc5fe555f34f84a83e4fed3 SHA-1: 281e57f1792de6c6765b58eb9adb60caac415775 SHA-256: 103dc78b87698f62d50d4953e09b841ca6c8d8734f727ff0b6eafad3df92663d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests the PDF is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/92828846214.pdf In PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/womirodefab.pdfIn PDF document text
    • https://ubranni.com/uploader/files/89959415538.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/vidinif.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/81277338002.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109061544172792.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/8602669140.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jitazetumotur.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/56587063181.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vezogusijalupelikazos.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907191512.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/tozofugotagujilog.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/49682876481.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/d74c6d5bb2c8fcc0a154c57baa52c4e2/lazegudure.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc35cca8---zefelukirexarukuvawaze.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/74090253286.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/58484343375.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/dijewijanovekumulefarutut.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/silaperojamatados.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/91502530603.pdfIn PDF document text
    • http://ridendo.cz/files/file/48042671285.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/45302298318.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/1660468886.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/lapugesabesekavulat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hd+tv+apk+latest+versionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1