Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c74cd53ab43330…

MALICIOUS

PDF

93.4 KB Created: 2021-08-05 22:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9eccd37685511a92d74459fd93de9fb4 SHA-1: 3c7b629f9b3135640d62e1e85f7d0e53db328e00 SHA-256: 67c74cd53ab43330fe8415433cd633d84262eaac69cc1d8a4c74ef3931b5c8f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cc37aa571d13552f0dff7cb06b62d4fc/61533124478.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2c9aa6e8cc016201c11dff541de2e7d0/gojupuvub.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c99a1f23b9---ladawow.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f746d8fed5---nejoresekawuku.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16071df20c91ed---nulejikaxubomixoxudo.pdfIn PDF document text
    • http://geoman.cz/data/file/76174952580.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/41dc1c150a8e9538b735b4239eb26b44/jovudebobonon.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rq7fnuterpgdej55ntnkhgmc8p/23583165278.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/difepagevaladekosewa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8cf82196---lelemodes.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f3d02432---nofisezanirunenosed.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/22492797153.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7d9f59f3d04b8af0cda618c2f9be7192/pitatowipufuvinuwasi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912a06dd25---kunan.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/22554840812.pdfIn PDF document text
    • https://melz-feu.ru/upload/82978146616.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/12425881937.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b7844e3c---962436249.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/40622818733.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/99386728183.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/87432495309.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/85adfc9a4f6d4447faa8e447a059cee7/83456536553.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/kitirutolexesazax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=stability+ball+full+body+workout+pdfPDF 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_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10692 bytes
SHA-256: 2e326e960ea04b2c65cb994a7272a6ad333292d74ac416a65a001361647c1ddb
font_01_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 16800 bytes
SHA-256: af26eb453598967f706a99098749c1b0ae7e3a9cb79d7dbe7e2b2611ac7b87b3
font_02_sfnt_off00014e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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