Malicious PDF — malware analysis report

Static analysis result for SHA-256 932b4e83828514dc…

MALICIOUS

PDF

62.5 KB Created: 2021-10-06 02:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d447a4147583bd4ccf565febec600135 SHA-1: 096f2fc69cafaabaa8cca1f411b574537fbfcb27 SHA-256: 932b4e83828514dc2f2d6213b44a3c7a19949eb559959c153f47503f7ee68b18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of external URIs and compromised CMS upload links confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8994

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://catamma.ru/uplcv?utm_term=your+personal+hygiene PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d509447ee---pafisi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a74a4ebad---nilav.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/95241693605.pdfIn PDF document text
    • http://ccsl.asia/files/jijuminujobukowo.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/wixozopek.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/gusawotevubum.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/gurapusudojiluvopo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/sasidunisepito.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/begejobe.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16147545fbefe3---fokavejime.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/50246894564.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/poluwipodov.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/15246330651.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/62001581037.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508602b202c---83889919455.pdfIn PDF document text
    • http://stl-hk.net/userfiles/51265129330.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210905005539.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///27404915586.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/doturinekonur.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419976d0ca3---lovigenulukulepadekupip.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/13323710479.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_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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