Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf585d4cd4497430…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 22:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bf774d4c03bc66def17e1201c391e6a9 SHA-1: e0626bd340f9c1d782c128170daf426ea1099ad2 SHA-256: cf585d4cd44974308c3775b36595e035cb08cd1cf920aa3160644dbdec15eeec
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f624e565e6---3890866257.pdf In PDF document text
    • https://willes-gb.com/uploads/files/202109050401378564.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210912190911356.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/25449324686.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f028f70c---10927985660.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/rakotepiminivodulivo.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/36435074345.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/21863819202.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/41677391433.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/vagapupikobepejigegigi.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/30537914988.pdfIn PDF document text
    • http://thekkadyinfo.com/userfiles/file/kasonuzuv.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/27513181177.pdfIn PDF document text
    • https://12shio1.com/contents/files/81979677837.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142456a913ab---4690439350.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/41816167596.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/xudoxe.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/zevizonamamunut.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406670cdfc8---zaduximovopito.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/vejuxureloju.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31977936701.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a10746e66b---81243717232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=but+darling+stand+by+mePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 10876 bytes
SHA-256: 37442ec00f27a79c43441609d0fd0bc6412eeef9ad4c649698d60a4d59f93ace
font_02_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 17428 bytes
SHA-256: eee6a5eafb9464843701b71acd659fd450a0ffd308e38234aece86ebfe001d6a