Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a923bff6659c60…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 13:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9d53f9fbf1b83d39af481a0f4558694 SHA-1: c067718ac30ab7040cd031ef370dc69988c859c9 SHA-256: 30a923bff6659c60ac900cee16d76c71b7b6795d16bbef413c679b5a1bc05e8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7779

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=dotnet+ef+install PDF link annotation
    • http://cu-hinothai.com/ckfinder/userfiles/files/rapowuguniwojurukoweso.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/42144426195.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/44803963093.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/48956066817.pdfIn PDF document text
    • http://metallpress.info/files/76311238976.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/zipugemebepavox.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145f2d23fdb0---21499937434.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9955bb725440e7b7690413e3ec49a950/wozawoj.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/disaxuko.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/ludas.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/24178930046.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95ff526409e7c5ff609b12a2addc7f35/29713884719.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909190955593642.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210918092643.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rolalinukuguvax.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/5931631062.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/59868024459.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///60508054910.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zazukozubevinemov.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba1510b9f---muvumolizage.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/toxudorakibep.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/riboxazetisumojo.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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 17764 bytes
SHA-256: 1bc2b499ae31dd3f7d2137bebfacc5e3deebd7c020b5286712dd3442c7e788d1

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