Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54bbbcf3ecfb3f9…

MALICIOUS

PDF

79.3 KB Created: 2021-08-15 13:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7ea9aab170efef5797d6ef06887ff1b SHA-1: 38432c4879d120c2b3a5ca48c88d94c04b429d03 SHA-256: f54bbbcf3ecfb3f9cc7dddcf2ad59c4aa1b39256c94ff098c89f1f1b3c71307d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://medvor.ru/uplcv?utm_term=best+diamond+pickaxe+names PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160752d0a382e0---xedetagepiro.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/792454175eca168e4e099458b9712a39/64346352850.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/02038bf10cf53d56e042466c4cd90748/ririgimos.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/22969168006.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1be5c628---wusedivezivolenefapegoda.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/43000509348.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d3342beb628ece1d373bc1d412dafdeb/24144397828.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tabova.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/sawexifepemamil.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/zebuz.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gurevosesukomip.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/44210954784.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/40521742564.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1ac8ecd932efb92371e4519cc04c3aea/57049506299.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xamekegaw.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/20437712368.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/53779724753.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c885c46d566---13163741988.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38dc330d7---16395294017.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/lomali.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/9014891656.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/73b49d59240cdbca333f5fd1c76e6179/vifup.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c190a3d5---koruganetuz.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_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16988 bytes
SHA-256: c38c0ca3c4e0d4e907ad712219c68fc761e2999203523e45910988f2efa776d6
font_02_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 10776 bytes
SHA-256: 532d24d7647f31aa625f65802af8a2830a0f14c2a2cf064d28f177669181f440

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