Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74e280d3ec5d032…

MALICIOUS

PDF

86.0 KB Created: 2021-08-02 04:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc8f8804f2ebb625b5ac49b3619f2855 SHA-1: 24bec71dd1207a612dff01de9ee300e669736a4b SHA-256: f74e280d3ec5d03292e3d6eb35e891d0e405557ca75108edd36f799822e16128
172 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and presents a visual download button, suggesting it aims to trick users into downloading a second-stage payload. The numerous external links, many pointing to compromised CMS upload directories or disposable hosting, further support its role as a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mvmdigital.gr/files/files/gosebisibujejib.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/477b77eb79e7c058ad76ab7f7d9502d4/zikadivazewuduxetelojon.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/38899197200.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3416406f0aadfb04207f08f769f30b40/64683002352.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/jojaborugurotoza.pdfIn PDF document text
    • https://ikima.fr/uploads/file/regotidazebobomogozusan.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/27675002316.pdfIn PDF document text
    • http://hotstamping.pl/files/file/11578664312.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/48vjp58nm291p57lqk9sokot84/bipeditojulab.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e911eae91---69025623162.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/xugixixud.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160948d195c389---49334417442.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608615d2128be---91948840270.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/woditoz.pdfIn PDF document text
    • http://carszana.com/image/upload/File/sagikokoz.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3992a0b2364abd8933d1cb2ba2e138fe/wenazixifasasemuju.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad54a3059---luwupunegoj.pdfIn PDF document text
    • https://partnermind.cz/images/files/63851863141.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7b0c9d1fc4b968039d0bdc731ecc2a90/39761590674.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ebcc544f6911bcfadf78e7170e5d143a/wuderas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+you+remove+page+breaks+in+word+2013PDF 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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 17268 bytes
SHA-256: 70f54331be9097b9418dade73926dc6ca9b9cec4bd287efe3112f0034b29e4a9
font_01_sfnt_off000116e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 11648 bytes
SHA-256: 63cc106f64ed5dd9d77bda9697b3c47d1090858adee14d6dc3a5ae4a63e0a92a
font_02_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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