Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f0259b4a5ab68c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 12:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7c7f490f1debaf295e04d77fe38858c SHA-1: 059b072e061e16c72a993ccc906d6157e2862c2b SHA-256: 75f0259b4a5ab68c292126a701acd4ca27a721ba33856e29a555f083998c54e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary function appears to be acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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 https://pistant.ru/uplcv?utm_term=prentice+hall+world+history+the+modern+world+california+edition+pdf PDF link annotation
    • http://sashtraayurveda.com/ckfinder/userfiles/files/34187070230.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/sejuferodevoxesaw.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/9464256709.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/daveg.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nja5qkforp2i5rm54beughnsh0/mezepedixexenini.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/58292290840.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/ridiwokuzexasujaxabopexe.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff03a37fa73---kopinavomomoniw.pdfIn PDF document text
    • http://apvn.info/userfiles/file/rorakesenupokuzidorumukip.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1cf76726203cc85c8e90f5322a9e104e/56604632109.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160838830bbd33---tododaneloxasejitum.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/52701254719.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/3191153748.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/xekibibaparene.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/85967312024.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/silipiwijubiwisefuni.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/timodototixitonotaruz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610000126fcb7---22389760751.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6ced2e91183a7947d869cbbdefb692a0/34262241648.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3864c0764b---12341541881.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///kigokowifimusimafurade.pdfIn PDF document text
    • 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_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 11088 bytes
SHA-256: b89d7a112bf7fbbe0c0c20740f318ee5e4898aea0e5d343fa6cacb3dbedf5827
font_01_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 18432 bytes
SHA-256: 54310993af9049801a7e670653d679b51240dc8b6d0e6f6cc185b5abb00e3364
font_02_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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