Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c84ecfcba0652b6…

MALICIOUS

PDF

73.7 KB Created: 2021-06-25 16:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 814c910d6577b3e99f3a910e219d74a3 SHA-1: 4eb0b6a8fb52b204db04c2e8ce8424fd666e51fb SHA-256: 0c84ecfcba0652b60424a566c3c3294e53987dc25a64288addb4da0274428702
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The document contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://harasim.cz/uploaded/files/15002754539.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/839ff16f429f907747c64a71ee48d317/zopupefupejawewepiwaz.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161b2bd716---12993141305.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5068a432cd---1215498772.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adad860dce2---18666534957.pdf
    • http://limuzine.md/userfiles/file/31444427.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1541fd88---26309195616.pdf
    • http://dui-antidote.com/images/userfiles/file/wudugidofatefumo.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744f724320b---dixisexarolukatav.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8605eaecafda54e1b6fc81d76e801fc5/45134345822.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3e758522---30400840478.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/29618923688.pdf
    • http://fobas.cz/userfiles/file/36871418040.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7b3803b6---wabunozumifab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=income+tax+on+fixed+deposit+for+senior+citizens
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd8f.bin
f7d039af27cc17800daa3e78cfd2258ee752df611ce5cb6cd4203b4f8f288791		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 16664 bytes
font_01_sfnt_off0000e8e6.bin
9efa9f508fc86f39ed49118e03dcba1aa6cc29d49704e5b85ad0ad9112819025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 10848 bytes
font_02_sfnt_off000101fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 16792 bytes

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