Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f311524f32fc12…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 02:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c6e1ae08614ec35016f0352c26ebf57 SHA-1: d2ceb119f5fe0dcb85cdf6bcd2fb22fa1fd06063 SHA-256: e6f311524f32fc1280e45fefd7aee97e5e344e4d74f2d142530518e7039892e0
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=double+moiti%C3%A9+triple+tiers+quadruple+quart+exercices+cm1+pdf PDF link annotation
    • http://saokienviet.com/uploads/image/files/23927700668.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/zuroga.pdfIn PDF document text
    • https://maisonforville.be/documents/file/gegebet.pdfIn PDF document text
    • https://onecre.com/images/content/files/diguwatavawaxe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cf708a8e---miritidarupakuwigipi.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/hap59kncfaokmfl2o2egl50lfo/63658785379.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061003191783.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/17620579685.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fezanediravewoduxi.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/taboforu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e7764fad5---muvilulamuvokuwada.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d9b911a1---dujakaxewajefarirud.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/vuzibaw.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/28449639159.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/24594738786.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7ea3336a---gikowigikubija.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tobarolilu.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/42557503024.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6c51b07b---52085243071.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kinenegarako.pdfIn PDF document text
    • https://go2germany.ru/files/file/fufifolarap.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/35053292126.pdfIn PDF document text
    • http://www.heksan.com.pl/file/70522746665.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3244c415c---dagojarijuzetisi.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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 18800 bytes
SHA-256: d687712e22943f40cb648c9ede8eb32415f9eb96d21f114f99c6e12bed363396
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 11372 bytes
SHA-256: 73bbad114064bd30b098faadf243e5bd6e9b5cc01f224e376d68c793437fe3dc
font_02_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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