Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c4d2de8a54da18…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 02:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 61c3865d9a83450cc258ce885b08d0b6 SHA-1: 9aa306265355f65c693a13112f4d85b5365e6177 SHA-256: 74c4d2de8a54da187cde8c4b8251cf9e5dc0ea8775f53f1237c70ac91f158140
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or manipulate search engine results. The presence of external URIs and link farms on potentially compromised or disposable hosting supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ri3u8uccdth9l9grf2u74ga4l1/fifib.pdf In PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/81ef488b622fe0b8a5021176926257fc/gufulovofozupewerigi.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/69411695752.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/03tb7t0nabt0b6t3p88utlqq77/1439993762.pdfIn PDF document text
    • https://xigmatek.com/upload/files/pitimomedakijafexovemu.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/86436471978.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608da25bb2f0b---19143764257.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tmbpvs47npivvn72brcng0q7u3/zuforefanasukibed.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/21235433371.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/63325802716.pdfIn PDF document text
    • http://101balkon.ru/upload/files/buvuwubawanemirujuwalada.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/58705829984.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/midonirevide.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/23i40pvp613ouqs08p8u1t2396/94313086860.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/basadat.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/de4c3b381d16246ed5386770b89a2070/28444308616.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c57c28a26---88762209913.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087621879da9---68483391569.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/duzinovubi.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/witirufurat.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/70974189092.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210721_287ADB8508413779.pdfIn PDF document text
    • https://stauber.lt/images/files/xitusuguwozowegope.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/subufosuke.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/48473655958.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/64604563902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=atkins+quimica+inorganica+pdf+downloadPDF 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_off0000c4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B8 17468 bytes
SHA-256: e4d265db058819382e6c95740acf4dd4a33cbf8cdc49c159f908d4f5c8689a5b
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 11236 bytes
SHA-256: ca125739f884663f48576b608134d3efd426da1f240cd8b826fc08c8599b7c9f
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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