Malicious PDF — malware analysis report

Static analysis result for SHA-256 92871e0f14a03d65…

MALICIOUS

PDF

115.2 KB Created: 2021-09-05 13:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7608c6086c6c15f0df097c71ff908b62 SHA-1: b2a94a01d79383c1655e4d8b2f7d7eb808be72b7 SHA-256: 92871e0f14a03d65e93f2e9bad611bd3e3b2b3b4f1f0d45aba1d22ecd1d55be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=mastering+emacs+pdf+download PDF link annotation
    • http://from.ua/upload/articles/2021/06/19/files/68993567898.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d210a6c148e---vakogoxepirulu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100c90fb3707---jejamumek.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd955dfc6b---6090360354.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/kiladifo.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/dagutolexefolu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/mps3p4h931d81e1mqlloch00a5/samovetararikoxen.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/verilaxivubifametopu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/68d674f786997f96df858c453ba05e4d/fofatixonorapepigijevolep.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/xumakalomiboki.pdfIn PDF document text
    • http://hijoin.hu/editor_up/12482220472.pdfIn PDF document text
    • https://stopserv.ru/files/file/zagozakumuwokiwijiz.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/t0ejj8ctdfj9qdma6ogh5c7cm1/85040831626.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/bedepevufagibojigubaninod.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b30c623f6---40146995535.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/negad.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/95270112797.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/kamamitap.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbe5a62345---lidogom.pdfIn PDF document text
    • http://kclandscapes.com/ckfinder/triplebuserfiles/file/viwuditobako.pdfIn PDF document text
    • https://paperland.bg/uploads/file/83815807942.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/velar.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d303fb9508---xavesiganevalibu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c10d7aac---sojunebi.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_off00015c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C76 18896 bytes
SHA-256: c85401358f6409a556934b2b300455ee83d93c90daf9f46979b16b0c17607268
font_01_sfnt_off00018cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CF7 11040 bytes
SHA-256: 2427c458144ad12ff5a3f067efd555b590ab947bc1facdbb913bc26d648a460c
font_02_sfnt_off0001a684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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