Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8df4591004f2bd8…

MALICIOUS

PDF

78.3 KB Created: 2021-08-29 07:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79d7d28959384dbd2be2756e8c4dcd82 SHA-1: 7c9423a4ff1c6fa1a85e0b39a3f39eaf0e46b053 SHA-256: b8df4591004f2bd8a003ab18a03343dfc63aab99278c28e91c3365b2a98b0747
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the interpretation that the document is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=our+system+detected+unusual+traffic PDF link annotation
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16111fe8920107---11523188108.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/35205255150.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a09cae4825d---8720083314.pdfIn PDF document text
    • https://loctra.net/userfiles/file/fuvobozugusalatop.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/63731463559.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160895fd50d2a1---lesekeluvuxakawewosur.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061004043364.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0a5pdn4upcr0rna87b99l5k25b/pivevomatisurodem.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/3465266341.pdfIn PDF document text
    • http://vecsecity.info/editor_up/96415284103.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/12844851729.pdfIn PDF document text
    • http://sns.hu/_user/file/sokaziza.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210715_193723_109.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/vabinawevib.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/makejisiw.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/vopesibisabemupalopix.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/59ac4b4e66ae0cc6f337da3794cfd129/90030058038.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4cc0905e---wanidexuvelokixe.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b278fde4071---rimowabigida.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gitqc6au14hobv0udsvou56vh7/67313287947.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8e95ac9b---48599603987.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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 10756 bytes
SHA-256: b983a584811319c2958a97094137ca2619c78cfe42d61db94e3eb9165aa1bfc6
font_01_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 17080 bytes
SHA-256: ce70188f21987338d1df991bb0798e99ebf702a2252f8c34c934c35292797d78

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