Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ae28a9005ab1fa…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 12:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd28087da4a7471b1c6471f90debba3b SHA-1: 29b73be884c1216535e83730cb03368665865358 SHA-256: 70ae28a9005ab1fa3c62faf4c59dfc79717e55c1b242dc0fb411c894b07d2777
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4611

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=convert+pptx+to+pdf+online PDF link annotation
    • http://llux.vn/uploads/files/nutabowisekedirapudiseti.pdfIn PDF document text
    • https://attack.lt/images/files/nakutumawidujeka.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/zifafinobuvob.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d7771314a8c59c1663ec96a50d8fc4f8/95947009474.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/46115919133.pdfIn PDF document text
    • http://sbairs.com/datas/files/gudamudetoxikovuferigoti.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_111559.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/78620780926.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319f5388526---bironotobelopugozuneg.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/jasitekeradod.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/gijavasuvimo.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/bumaxuzotepevi.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/72653993194.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jipadati.pdfIn PDF document text
    • https://argumentua.com/i/file/88125775449.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/zomirola.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/45350143297.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/25226601447.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/getugik.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/73461259623.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/71519725740.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/26804784749.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/vekomov.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e876090b---takakanorosofuzetazumux.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/didaxugefufifekikax.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/vigagilekoxuna.pdfIn PDF document text
    • 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_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 18248 bytes
SHA-256: 18eea872c67dc924c3abe6d24d07abd224e546bfdb1d1bc9f9b03b70caebc3f4

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