Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5ebb8cfa1ca0a8…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 02:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 62c3694df20d64df295f70a8f3d06514 SHA-1: 39fb92c92bf6496d7730afdd6fb8d2bf5bb1a99f SHA-256: ff5ebb8cfa1ca0a8cd1795eb3630614f08f477c5cd68ba1a202a83d44eaccbc7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The embedded URLs suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3afd42d9b4---72979480563.pdf In PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/buturepobij.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/bipokagimoputex.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a4b145f8---zuzuniwob.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b1eeg2mlb2riq5r06sc5nmc0g6/49832161728.pdfIn PDF document text
    • http://valeneighbors.com/userimages/zexopuwiz.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/7332075421.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5cfcaa49647684a5ebb770b4ccbd1eb6/xojuj.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gbf7thl3js69me3gpnkcla3ujn/15085615149.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d12e67984---vupake.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/goleburidovifu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b310a7ffb8a019fc56b3b0a5223d04ac/17873492163.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/48594916114.pdfIn PDF document text
    • http://christopherdallo.com/file/gujivipekipulimo.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/nepobulite.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/dazekenugu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608162c63b08b---suregavir.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf360d098---sajevexotibixiweb.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8a08bae97---90480161485.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/26705073314.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d549be1b0253eb172fc48451d94a194d/31472345169.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1fdaa2c36a4f77e5039f898d186f4420/vubuko.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021525450421244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+song+for+you+lyrics+amyPDF 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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10644 bytes
SHA-256: afe34993f93e9e8ac71e951d9c53ba76f1339bdc97c58931feab34b75737b390
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 17252 bytes
SHA-256: 9452d43bf504ff57fbaf8602d8ecb7fee3158dd6223196733d1504012d98bc53
font_02_sfnt_off00012ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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