Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e025dc2cf9e0b34…

MALICIOUS

PDF

83.6 KB Created: 2021-08-22 01:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ea417a3afbdbb5ae55417a8eaafa70b2 SHA-1: 6d2f508c12af991b954d786605c0e57983443fb2 SHA-256: 3e025dc2cf9e0b34dddcd0c7cf3f0a6a7c7e3849baf9e33ad6c28c9ad1d1900a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests the document is designed to lure users to external malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synersys.fr/contenu/file/babupibefinavasetume.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/jadakudejefid.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/makefavodoripafubadudo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160856eddac3f9---87999172038.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tujukofovugi.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/898563684.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bixokirubixek.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/5866871366.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb1f35e9bb---8832333396.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/84776665127.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/gaxaz.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/15767994974.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc26b95e1---walunulaxujotomofutasapa.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/monaveluki.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a03e66ea0---givuwugezidalaxovetisewe.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/moxubaripafanuwasixi.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/moteronibalopaso.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kujedilogajukalogizebolin.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/4961756074.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d45192c86---sejin.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/gefawotisuvexefuxese.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2aea57072735294b61eccfb432b5d8a4/sosegifodizefabefusojor.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/menalekarupukunareliju.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/2888178394.pdfIn PDF document text
    • http://bscartridge.com/pic/23645600921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=plague+inc+apk+full+2020+espa%C3%B1olPDF 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 18844 bytes
SHA-256: 449e6755f235148ab07e19b8267f08a57832356d97a639cdec1add6b011edbaa
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 11096 bytes
SHA-256: 60559a82074f32fd012892a7431b28df6d31478bda5249ebab7028d0d432c88f
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1