Malicious PDF — malware analysis report

Static analysis result for SHA-256 51347c1a658b7ea2…

MALICIOUS

PDF

92.1 KB Created: 2021-07-24 20:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdf0d474b5c4143d58660d8e27a2b5bf SHA-1: a3354eb7797e082894c39f7c2dbb2c2982b426bf SHA-256: 51347c1a658b7ea269a2d65c8f99e44ad2a80b9a00df9c912a93f45036fddfa9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://apexibd.com/uploads/fck_uploads/file/68919117894.pdf In PDF document text
    • http://targhevaticane.it/userfiles/files/kumaduwabaka.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b555f093---49931706615.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vf6vc1a876v47kh53n8tm5qumg/pobewe.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/goditiwek.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46749b26a1---37098567181.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dff07323c---modav.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e7bd64cd---20058273497.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/begufixukevegef.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/dekameg.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/5807188903.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/i888s969keudtrh018ko08f9m4/rumoka.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/71925654594.pdfIn PDF document text
    • http://winso.tw/userfiles/file/35249889000.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/120a61c56d59ac1532a8301fad8139f2/waxupogadaduxikojamamas.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/rapozonarugarolef.pdfIn PDF document text
    • https://pmms-online.com/assets/file/10665705148.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/vabifer.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/04c05c6c68eac5e4106ec8083a744768/zesizirinog.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rapowojomojofalavaxuruma.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0583920864---pibosudiniwuriwag.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea22515cb2---92104295619.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/zopukadazafudesur.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/ranaf.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/76968877755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=books+like+the+summer+i+turned+pretty+seriesPDF 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_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10856 bytes
SHA-256: 1905c33af96cf71ed06299b242c40ab0acd42afef1d33a28d76b281af2bef9f9
font_01_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 18564 bytes
SHA-256: 886fb169a886f12f015cac6528337f9bb6c83cbcf697a3756db3029717477fa5
font_02_sfnt_off000149c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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