Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f898cfcd9fe2db4…

MALICIOUS

PDF

95.7 KB Created: 2021-07-29 18:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a15c1672dbecd5ed518e57d2439a0e6 SHA-1: 4a8f0100626b3edc565cdfee5ee3ca855343add2 SHA-256: 6f898cfcd9fe2db48cc20d659d0d78e5fb7490c7f94f4e10c74da1ed601d4ec7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/lodubotupeba.pdf In PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/af5b2fa8a6fe2b5636fb5492a1c3d869/fufuwulox.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/53744351149.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/33211270804.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///61052299168.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/jelolojemavef.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5a82c176---42733719072.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/6087383075.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/81264929287.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/92597703086.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/dedoguxipupupawo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3105177051---44110004212.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/tukonevatenipajerofow.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/33510778850.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9j6u20rq6v7vu6mm6sbtr0p4ss/52565086232.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/114d3d068d092084cde73524236f77db/futeda.pdfIn PDF document text
    • https://miet.hu/kepek/zunezodubusiki.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/xomitezevexufezo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/62600565830.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kefixefexasofopenadumix.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/kamojosovilir.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/13484551791.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4af35593---15286383565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=catch+me+if+you+can+true+story+bookPDF 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_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16872 bytes
SHA-256: 39d7748c28a78c508abb1d297a4a170e99f7fcd535b2aa08ee952299fdcb278c
font_01_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 11032 bytes
SHA-256: 723a194578c61cd59ac902cac517ba612807185e65244b4f1259270213d5b8bd
font_02_sfnt_off000158e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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