Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f010b53981ae51e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 18:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25305c66d37d9bbe4c2a062f426f8a81 SHA-1: 1e8278e93b4943ac1d23fa36d4cfe3004f72470b SHA-256: 2f010b53981ae51e816bc557fd9be8d919e9a657e7d70e9592b2f70c0b95d286
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://pixomot.ru/uplcv?utm_term=lysine+codon+sequence PDF link annotation
    • https://bahceneryaman.net/public/content-images/files/88091507481.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/tifolavadotij.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2b713094---venakikazotemusuziweke.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gobezatoj.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614427bbc344d---xufesuvoso.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/40395041384.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/25032298869.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908030803-totifowozexoba.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/25340770240.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/75288154091.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/75901603996.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/bujetunazixirufusonavupod.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210903_111636.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/51523807766.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/85454315546.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/039e52881a2f3d91df52aa9557c64898/jobefitojuxopadafe.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/17558826005.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///danoruvo.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mebasilefoliwutozuva.pdfIn PDF document text
    • https://panama4d.com/contents/files/71408213739.pdfIn PDF document text
    • http://446888.top/userfiles/file/484381628.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614496ae85625---8068130077.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/98106530156.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/bokefururitumisigedukud.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210913003628.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/37549567535.pdfIn PDF document text
    • 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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 16872 bytes
SHA-256: 7ea0e7125ea73ac2de85132895488687982656b3aaa49180c39146619ca06764
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10272 bytes
SHA-256: f689d51940a67eb3f9edd0ac08b0c5bdbe049b3b788732a370dd3c6ae5942939
font_02_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1