Malicious PDF — malware analysis report

Static analysis result for SHA-256 1656108a41cfba03…

MALICIOUS

PDF

88.2 KB Created: 2021-08-21 03:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08904d14b98b0c5544ad38e7d4775fcf SHA-1: 4ccebf3328637e89b075523bf41ad536ae265636 SHA-256: 1656108a41cfba03f18a0de048db73978d76fbf6e00c64294fffdd6bb934bce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/62bc779e180055efebb5cd4e1045a167/43913102305.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vjf5bi0sbbarir3e6dbga0mnf6/latugokupizog.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0852c67e---xigesunelipegomonezo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/51415569683.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vimabupodufiwevejujowifo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1405a7ce7---ripenulilakupebofozarudi.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tobobumevelosizi.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/66554514796.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/setodifafufuduxavobobop.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/domulekekem.pdfIn PDF document text
    • http://slsnn.ru/content/file/xavusewu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/117b5c8b5a6b61f4177a53cb0ab9ed0d/84815331286.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7878e0364d3a3e2b414cef198e67900f/fesutalebenunixul.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gamavujirukek.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/66027253891.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b11e4357---gefoxevemugewojejapun.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/15190532513.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/damile.pdfIn PDF document text
    • http://mobitransjogja.com/files/ralirigegakate.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13e9db4c784461101c547a4376c7d0db/vetodolozogofuzatudura.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/siwafozono.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/wijesegojopixejanokupozi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/10295980af71b3e7ddf4b4d1096288b2/sowixaxenegaziz.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/wokiwigitaxa.pdfIn PDF document text
    • http://screen.by/images/file/5270342985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pros+and+cons+of+selective+breedingPDF 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_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16516 bytes
SHA-256: 8eafd18484b1c3800af587970d8cc71956ed650fd790bfca72fbe2851f20d765
font_02_sfnt_off000136fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FC 10860 bytes
SHA-256: 8912179d7822254f9e6087dcfe61d10f69f61689b7316363982391e1d71afde5

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