Malicious PDF — malware analysis report

Static analysis result for SHA-256 26725d95826aa019…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 02:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87c1de69be943e7801d8af60d180a9cf SHA-1: 504a0d1b0f786ec44c12e95572e91e7f2870259f SHA-256: 26725d95826aa019482531969e8ff68678b7c2d7e520145d123421072f3921f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The primary purpose appears to be redirecting users to phishing or malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=libro+genealogia+de+la+moral+pdf PDF link annotation
    • https://sona3elkhair.com/userfiles/file/wogene.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/vuxuxarite.pdfIn PDF document text
    • http://tipiland.net/upload/file/29356551602.pdfIn PDF document text
    • http://gr-chem.com/upload/files/43391446563.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/narakojijikuvapawelomu.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/pamizagotufejapeximas.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/85529629036.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jinamiruf.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/pekobis.pdfIn PDF document text
    • http://secretinvitation.net/images/files/nagoxoxoziz.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/89988057336.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/18166080413.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e617d1b0d0a---3169067217.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zosinekemu.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/nagarategebebo.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/54447594920.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f7156a952db326961222bcb17d1c6fea/5875810150.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/28626154829.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/53317706604.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/169cc5fd7cbb9cd0e86f92cf040eee0d/donam.pdfIn PDF document text
    • https://aristonails.com/articles_files/files/gujakafimesefeku.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/arlt4jb99pgphf7gjmv3c01ln5/ligurafu.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/buxowu.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/bixonade.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/zetig.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 19996 bytes
SHA-256: d6161929c182816cd4e0c751e13eb40d80df850524c1e6ae9f3f39a7899a8395
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 10672 bytes
SHA-256: 050ee8de0f7f8a59ce669b5896f85123c9901161206b5e64bc45ac2f9efe0406
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1