Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb86c876886bf114…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 12:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fa94a04d49e2f7d391fbb3a4cb1c00d SHA-1: fd43f2bf30800147dd2a3b2085d498bfb0957998 SHA-256: fb86c876886bf11437a54ce42da6f12b762b5275f15d1ab92c103d78ebb77254
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are part of a link farm hosted on disposable or compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=miniconda+tutorial+pdf PDF link annotation
    • https://okazionche.com/files/bupawadewem.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfa00b0768---dafagezabepevisel.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/38229418747.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/73170683908.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160772217625d6---wufuxotilavopew.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/16944929488.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e288ced3422---78344244022.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/beresadanoxulomalajawalaf.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lexurepimidudut.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783268ae436---lakefizurexo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3374574f---mudikowepefeg.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/9135840926.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/91739211270.pdfIn PDF document text
    • https://soechi.com/userfiles/file/74791550644.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/lumuxofedonurobe.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/46279816070.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/vowoxekumakajot.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3f76512a949edad3990b8061f9e58c54/wejubibawuwerologejusexi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/510b542faf07d385ab91ff5f2828d56c/6105168696.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba08b813dc5---88890875703.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7235619245ea39fa029c4ee00bc1f910/6342751325.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/21822015183.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/vasokulebim.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/wuxapotekibuto.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/mikurilikiwef.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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 19220 bytes
SHA-256: 8ab0f189dd4da9baee4414c4eee1c7430812b60fb31ebe6aa2d5cb8ce7bf1411
font_01_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 10404 bytes
SHA-256: 4ec351eaf26a26125a357ba34cc83980644f7c907050dfefa42b4abd23ac701e
font_02_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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