Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f457672f7d76db…

MALICIOUS

PDF

66.5 KB Created: 2021-10-06 12:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 53b6d4c8e5e61d4bb5ae3281ce38a6d7 SHA-1: 85fc71c6f93ce10281ec5c0f617e370e436fb223 SHA-256: e4f457672f7d76db842f65f3cce4129a37c9ae623f1172cb76604a99d015c609
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

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://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/84626854504.pdf In PDF document text
    • http://liburnia.pl/userfiles/file/40841715152.pdfIn PDF document text
    • https://andrejc.si/files/file/konuxujit.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/zemowumokoporejafifexur.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e83495ffb5---59636817357.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/xezux.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/98852872032.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/63486155745.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/visebinobijaxivufakigu.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/kulugufumawus.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/19803141772.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/veperuvagasi.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/mesagobaligenolez.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/petesonavoderulomigunax.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/lododikifipimagejapudem.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j22pjsq23nf463r83sd8slgt2g/rozedotewelaj.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/49235339105.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wikusovanosiwitinopetese.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/runoruwaxa.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/lamiwoma.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/46cf14eeb0feafd705a9e6627a622b80/29294407995.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202110040653082710.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/foxisuzivaguroridakunelug.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/fijixapakizamafujew.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/13316036500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=guinea+bissau+natural+resourcesPDF 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 10500 bytes
SHA-256: b4529af99ce8256fe4d4df6737cb56a9e6cd3255e9b71a7172875444ae1192cf

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