Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf42705626824b8…

MALICIOUS

PDF

92.4 KB Created: 2021-07-25 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 07c6fb8d0c3054de54d084176d4646c6 SHA-1: 65f51c75421f4b82ccd8797dbdd2c4720f4434bc SHA-256: 7bf42705626824b82a440b74dba10ee3a9df7f7eb28f616496f7b87153d2ad79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9970

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://commune-bourre.com/userfiles/file/pizegisof.pdf In PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/6669e0b646139df11cb69073e71649d4/75966304674.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ebed42e2254a649b0695bece1b442be4/jogifepuselafiwib.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/44c0c0fae4a4933d151ac750b5f3b17f/rubaxejuzatejibaralisovug.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4051d3047c---76327908634.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/36509232933.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/xufiriwumatud.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74cfc9bc70---68225377561.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c907202fbf9---51053973501.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/98735288050.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/18179149422.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/mivaxevopezu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jhsebg4vbbignbt6trnpjkpoi7/zoragumuzexapav.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/62131374951.pdfIn PDF document text
    • https://pindimana.in/uploads/file/78515308752.pdfIn PDF document text
    • http://novichiha.ru/pic/file/68052254179.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6849f7bd0fabe3274ce55bda0bc20f5e/xatujepupifo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076788b6fb82---fadomemamuxajig.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce902727fb8---35975535076.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca2e79c96---11888048986.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c06191de---peruwerexajulagunuvovel.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/kozatanadizogerudej.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/39698818051.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730c29fcf6---misan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=application+format+for+noc+for+govt+jobPDF 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_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 20148 bytes
SHA-256: 47dc131567c79328c573019b0192e9818105280f0aa23d36ac5046e6e965b37c
font_01_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 10840 bytes
SHA-256: cf7755e1cdba2597d2f32946a0ed874142cc45a75de4ea05c8430ca026781231
font_02_sfnt_off00014a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1