Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68f00ae6d403f7f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 10:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3d8ba647298302fcda04218d543f6e7 SHA-1: ee4297974304244dccc1740407db25191f8b7a07 SHA-256: c68f00ae6d403f7ffcc232ff0a54cd8da17eaf209e2985e1a63cd94a2b4b752e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8669

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pajurioverslas.lt/ckfinder/userfiles/files/muxovefimorolutad.pdf In PDF document text
    • https://hometeamcorp.com/images/usr/2323746591.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s28kdivc4r6qicnvaueh5b8jtl/famajixaxaxototomifub.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210913103121.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc0538b5c---6655033410.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170a770f59---1917728437.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/57151976190.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/51066825588.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/2662848563.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/12597075841.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/20583502851.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jenexexaze.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/55055713553.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_FD64FE094ACE87F1.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/81524570300.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/migomukixumajefixo.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/28392937459.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff07a78810---kofajafibopalaxutinasa.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/35908244141.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jijufed.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/83305784689.pdfIn PDF document text
    • https://led7.ru/file/nifitanudifuf.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4996f403085d1a08196b69a45f4b3757/wopetugudixeluju.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigozesowofuvevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=game+ecchi+for+androidPDF link annotation
    • 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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 17272 bytes
SHA-256: 3e06599e0e289bd90501d8df37157ed40a721b6b450411fbb0e6cdac8936704e
font_02_sfnt_off000134c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 10468 bytes
SHA-256: 73fdc56cbd0f877cd13f59e905e40c92608c2172625376f3cc793a8479aad4ba