Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2598de4aee6b17…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 14:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5d0f0292c339214bd37dd5c968ca22c SHA-1: ff4913a9c00494373955fea6ceb58367875cc719 SHA-256: 9e2598de4aee6b17108a9e3a9828e289f8680d57da696768fd8a3d8996ba1e7b
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=super+smash+bros+brawl+android+apk PDF link annotation
    • http://topstec.com/d/files/favebe.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf2d83ce86---24873913201.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/83077210094.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/pobaxoditupen.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210914144316_1254870733.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/87251958015.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/jojalufunudeze.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8c0ab2cd09a335309e3b377035c1abd5/gadilalixedufu.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bunajaz.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/53382816474.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/4855459369.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/fapexewogarobovifezijurej.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rm2pl6pfrt84rplun8pild42mc/gujagawofapakogi.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/15330646697.pdfIn PDF document text
    • http://edituj.cz/res/file/82132571924.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/24905680783.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/76024960953.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/41345485678.pdfIn PDF document text
    • http://chikatere.com/Upload/files/69988438030.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43d8a60be---90536479453.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/bibijubekaf.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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 11052 bytes
SHA-256: e7ddf1f8e28ac844763009f68d2d9c5ce003ff8b34de53acd6a36b5386289f22
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 17868 bytes
SHA-256: ba4ee18a394edfa92dc78e279b7cff7b2fc0384c8f4b20a7ca1b8db02233e26b

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