Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acb0bc2cfadcb66…

MALICIOUS

PDF

80.4 KB Created: 2021-06-02 20:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 15a8dc5a130774b361cecafed59b56f7 SHA-1: 1a65ef59bc4eef46d2084d0192bcef859c53d1bd SHA-256: 5acb0bc2cfadcb667b605356ff35c265507dff4f40b3cc706da70be58c19ebc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'Valguero resource map' and 'wkhtmltopdf', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6761

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://queure.ru/uplcv?utm_term=valguero+resource+map+cementing+paste PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/o3kbnkg7nh2qimc039me5i8e42/vamopijozaxatabifofexifuz.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/31915896636.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fakitolufidelejevasovimog.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sufesuril.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c3a23bd3---37956430272.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160828b32385d7---votejerobabug.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ff3b968832922f3b0c8393701f78ca24/pigobaxelapigos.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ab23524d---leboroma.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608404c9d817f---81986327308.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gosoleveson.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a680cdb42d---wizapoxitavev.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/42f38e962a147447e60cdfd080601701/7320034234.pdfIn PDF document text
    • http://sgpeo.pl/users//file/94072207871.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2fc9fdd---69796645235.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jodur.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/36539978867.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 5220 bytes
SHA-256: 0d7ccb14a012dea880d8df535de4c164b05d327f15e075bae80a13675000a94c
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 10340 bytes
SHA-256: 21055d1e6acbd23ce2479bac75e0306c46c9e2b1bfed35449190eea4663d7a7b

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