Malicious PDF — malware analysis report

Static analysis result for SHA-256 99818b988046e374…

MALICIOUS

PDF

63.7 KB Created: 2021-09-26 19:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 954aa33426166b850d42a102b602a84f SHA-1: e708d1f288b991113bed8e2c00829629e723d48b SHA-256: 99818b988046e37490d46d93326dc491a203ca0687fa219242d58db2bcce465c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly indicate a phishing attack vector, likely attempting to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5839

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://laborke.ru/uplcv?utm_term=how+to+print+2+pages+on+one+page+pdf PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d769c13b---13502950926.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497eeec64---najaleguwibowotinepuwizu.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210910_234939.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/vijekuruziwano.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/fumozudezaki.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/bilakowebiximino.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/midiwekojumukoreju.pdfIn PDF document text
    • https://12waktu.com/contents/files/jefive.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/telatorewakepinelafine.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nuvijinitenenib.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/38258825457.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143ab17a8f21---72106472741.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/gaxusoraw.pdfIn PDF document text
    • https://deloge-nt.fr/media/photo/file/97469303513.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/74433775459.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/julavifukokilexuso.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/42682518944.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vojirafug.pdfIn PDF document text
    • http://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/99627410057.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/gedarenumafozizogor.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/fotanegozejiri.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/10395694940.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 10824 bytes
SHA-256: f1bce2e9606534171f752f0414bd5f8657500223a3ac5087bc071a818ff3e734
font_01_sfnt_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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