Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e8cecc4ccd016…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 13:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6ca8bfd7c3dd86d7b53c138cfa5d476 SHA-1: eef8f0cc4e7f20c24d7b142b4b638b1e74d8bc3b SHA-256: 8d3e8cecc4ccd01623c802e2d439a73a1c62efaca40832ddaef4d803227d0931
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to these external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p7cjep1kovo0a85c3njqpm6do1/39484989662.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r7hkklj57h2po0th3u8u9p1do2/ladorum.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/77207113217.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/82122773933.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/99288979082.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/okmgo26ok0ohsdimm197mgngco/movemuvapid.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709e7864a45---belojokonujanakedibaka.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/41462077956.pdfIn PDF document text
    • http://neteyes.eu/editor_up/gomidovosudolekezuxodi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7eqekvjcev7eh8v4vs8mct684/37749646625.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c0e3d00ab---penudogo.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/wugubivufexumuzugipi.pdfIn PDF document text
    • https://invest.pl/userfiles/file/nosikigokoxuximi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4641528c---31002880170.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5e4651756d84317299823735c661d164/patazitudenakaresitab.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/89748719869.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/66461068203.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/robegikijutoxaruw.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/febetejawejosuvoli.pdfIn PDF document text
    • http://seamacros.com/upload/file/41423576017.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf4769641---simotarumidisi.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/5189287571.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e46fbeb376435c23c26acf0f33aec0b2/9917872394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=climatizador+consul+quente+e+frio+manualPDF 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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 10972 bytes
SHA-256: e780d47fff640d3a7bbea74250a31bf4ddcba069914522668d984a2884b80c60
font_02_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 20800 bytes
SHA-256: 327bbbf535bae9c00d89f2609040430be2cb50d685e5c424e67fd6844d4be7de

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