Malicious PDF — malware analysis report

Static analysis result for SHA-256 79436d2f429c17b2…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 08:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd2b61f4ec3c5e3115e3358ab955d352 SHA-1: 4d72a0a61c801f4c4bba9ac0203e8f4699a24272 SHA-256: 79436d2f429c17b216de1f753cfaa1ef452097837ea9d583630d89b8cba8e832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF sample was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, identifying it as a phishing trojan. It functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be to lure users to external sites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://getadoc.in/ckfinder/userfiles/files/63273068869.pdf In PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/1321124996.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tefenubijemotonuv.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagupuzu.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kobanevemuwotedemu.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/veregowuzulan.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/acc18cb836cee6d0fa6280b5c99796e6/25627113921.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/tuponatakebaxukigofitake.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sitdk27k52a8amkfmenntdmljq/watitopuseko.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074277b46236---16361763537.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/98211193251.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/zufabokewekalomaxewo.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/43571288593.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/80a9877070ff604d7ee2e5518f6b0dbe/ravetavemakukizoxeki.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/vuxanatelipibejijipud.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/67656215512.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102e95d8343c---fuvivewasejaj.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/52661069721.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/12983028081.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bqlcn12dfhldlc471bahdj4ro6/16456082708.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wixuwisazefukibowesi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41519bd8a---99798944137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=textbook+of+clinical+neuropsychiatry+and+behavioral+neuroscience+3e+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 11468 bytes
SHA-256: 0d21201f6855dbce78b6dd14fb2b00d766a93802f73fc105affa22e792d03025
font_01_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 17840 bytes
SHA-256: af834a7ecfc8c5e80abaf376fa0912917200c765f1bf542d39599b3bbcec0d5d
font_02_sfnt_off00013a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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