Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eee8ea4be59f0c2…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 06:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9036933c1cdc9e343061cf73230d28da SHA-1: a76d4115d1754190b31f1a617adacb110df5bd75 SHA-256: 6eee8ea4be59f0c2fb01ad39785cf671a260b9bd770944f4f9b5e64b74ca71a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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 http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/i14261rhhpaejmt6bp48gm90fq/38081824530.pdf In PDF document text
    • http://zeroseistudio.eu/userfiles/files/67727037690.pdfIn PDF document text
    • https://majubesar.org/contents/files/vojiwukib.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/51135569211.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/70744819492.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/pivega.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/rutatupudutakoruses.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/xibiri.pdfIn PDF document text
    • http://ccsl.asia/files/xirajesowazikukofug.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/25035062333.pdfIn PDF document text
    • http://consade.com/userfiles/file/25887768897.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb891109da---juxudufofarufexus.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/wesaxoxexebud.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dd891cb13af2aa2f4b6170c482027f2/xetewimevufuburene.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/15841059416.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/90526134127.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/40295831567.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zomesunujoxulanibuwela.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4cadf0ff---7807137893.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/bobobaxukanebazowadiv.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/33818924282.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/pupobuzuvuzafi.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/47571588707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=accessibility+android+appsPDF 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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10740 bytes
SHA-256: ce9a1533c1168b3fd49721b3f0202a194bfcc9f7f54c8e0980e9227dc800a0a6
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 18724 bytes
SHA-256: 2eb304efd4af3d5ec14725ca9a05e3f27c3698d433dae95efc87b4cf7b4bef45
font_02_sfnt_off00013a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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