Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7ef9999295862b…

MALICIOUS

PDF

166.5 KB Created: 2021-08-22 01:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: eb6ae178a7ee841bd53129d830df1e8e SHA-1: e07d04566be11bc20e5bc0b0f3b1d08cb86d4c21 SHA-256: 7b7ef9999295862bcf6ebdba80a7a40f4b562e999b382a50738aaaa6de816647
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xoxonetubovixu.pdf In PDF document text
    • https://danfort.lv/userfiles/file/26222262923.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/39580263762.pdfIn PDF document text
    • http://anm-av.de/uploads/files/51966826068.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/tikususikimuwiwutoninowor.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wobavujidizeza.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/norulupe.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/sevude.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a78fec65b---sufewimegewibi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160712140e3ad5---mikixoxi.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/22055691888.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eec2df849---56068379132.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aee3efd3a3767fe730dae266a5b8b8cf/wuvulariledisitidojuwivat.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/lelolu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/69491500872.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f634629bc4b---83573437302.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uqv8sogkg05qf8ia74fpndotk1/20771200873.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/96192145699.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9317ae00dc32343664e3c0aacd96b999/faxon.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16274614327151.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9038cf0113---mukutadosi.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/77378658206.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/batubegugawanorefeteda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+aeneid+book+2+translation+quizletPDF 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_off000229c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229C4 10968 bytes
SHA-256: 2f92b1baf138bfc064614d9e15814d66d07d00cd25635787f641cf60e805a590
font_01_sfnt_off000242f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242F5 18200 bytes
SHA-256: 069deadad21fb37ffdbcd174a791c5cb0c579c028ea1da5db8805dac685beff6
font_02_sfnt_off00027307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1