Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f368c841942ac00…

MALICIOUS

PDF

62.3 KB Created: 2021-09-02 23:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a877fffd4e0732b025234cef37f733fb SHA-1: 07958213003ef193b548b31c20cfcae1a5c83180 SHA-256: 6f368c841942ac00f786fff37d08262316806755fa445c1a7b31b1a802656b73
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 WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure suggests it's designed to act as a link farm, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9583

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655ef213ad---fedutolaloteja.pdf In PDF document text
    • http://flexicourse.cz/res/file/talutigomolejisisudukin.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c1bea046---lubijadaf.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/jagovevadibowufupu.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/93394253750.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210713_201933_3103.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/wozudaforopufop.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/xalikugikogitemi.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/73240286035.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/d0764a2dc85ad92de0459d66b7cd3db6/2843122603.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/xoxuwikiveviginumobuxa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n5frv81kap4nno6p9m6lilmca7/roberuzowe.pdfIn PDF document text
    • http://medrea.ru/upload/files/86797162868.pdfIn PDF document text
    • http://accronline.com/userfiles/file/83824173622.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/50ffafaa68d4130493f8cad6e6c26ac3/korovufowonotor.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kijedet.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/zajapedebofevaf.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107447b8d422---wunakelezivajezifivader.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/jifaluzuloximabivob.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/f8ndt9v82p0lktbhkd7d96f6u5/632672597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=complex+compounds+chemistry+pdfPDF 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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 11072 bytes
SHA-256: 773ea3e7161ad8cd5e5870c11341abf932355c0c19a79f192d2355447d81e86f

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