Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd9be08e225091b…

MALICIOUS

PDF

83.0 KB Created: 2021-08-15 06:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2274e6afe5104e236c70209a843bfc2d SHA-1: 15393ebe5f19e8bf8edfdcbcba362ca7931764b2 SHA-256: fdd9be08e225091b2f2fbd5e296a9eb8811177c78111b1c84bbca98c4d490d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to manipulate search engine results or host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or SEO-spamming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a1e28d7b7089760bbbf460913f74d3ca/bolosuregexarifaf.pdf In PDF document text
    • http://masonlegacy.org/clients/61515/File/91094830257.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750a31d1130---xezinam.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wisujibulugireriwuduxo.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca009128f6---22618659046.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fac5be920---51723843930.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/92915037406.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/palename.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/woxubafasivoxekedo.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/71341307711.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c2acd36f502---17961907667.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/sojixiwokake.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/89601729324.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/97ecc6e55bb987afab3bcea4f5413651/99456755924.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e0c70e47---mosevimi.pdfIn PDF document text
    • https://kimcert.org/E/file/75909960619.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jovepoxevowezu.pdfIn PDF document text
    • http://esistore.com/userfiles/file/zeluvetovimigunoje.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nipob.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752c3902536---74628158590.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/93332688527.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/30986376942.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/poponos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=watch+fifty+shades+freed+full+movie+free+youtubePDF 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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 16940 bytes
SHA-256: 95c817261baa24722554420bf25097d289395912cb461ec875beedfaff43e3a6
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 11052 bytes
SHA-256: 895ca874bee0d162942b82cef7e16b3de8b579cb2547e59cd771f0729e9b42c4

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