Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3cb53050f59ed8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 05:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 997260db6bdf4988b896c23ecf71fe17 SHA-1: bf9693fa3452e1b505a61910b48f4ca86498d212 SHA-256: cc3cb53050f59ed895eb33479b5d58429efc0ca186a33737a0862f8b409ce358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links points towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c1b90bcf---70062402639.pdf In PDF document text
    • http://hzeiger.com/userfiles/file/68808475397.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/sunanibexumok.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/borugo.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/petub.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bsq2olf47rh3srej14tp0ir4bs/58081279499.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210710_110211.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/a3ebd57b4beea8c3e026d6c7855760a4/jiwokinerovi.pdfIn PDF document text
    • http://unsersohn.ch/images/file/70924213681.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/89879675676.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gadozanofimuv.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/99306149300.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vebixori.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/fapid.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93241dc72c580f8a2d60c9dca7086a8e/52349009220.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160baee881d59a---14389233104.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/908afefbf769dbd8abc0c07eb25066e6/gojizawalezenixufozoxu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/99d126a8c448e8d84ef08958840503b0/58678747478.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b05478a1037---dimuviwudijokonas.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/41025104519.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ba02e188---23593040275.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/42655246352.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/pesibimezufewitiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+pdf+to+png+converter+onlinePDF 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_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 17232 bytes
SHA-256: add5c847fe5bce99196ef301257a82378aa6fbed8fcf159980ece6afdeb6880c
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 10752 bytes
SHA-256: e32d8583199565677e9071edda54e09ec19711b54aab04473b9adecf56ce0632

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