Malicious PDF — malware analysis report

Static analysis result for SHA-256 759eee17262fc7b3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-28 06:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0004b74089818b5ed865a77b8d968cd SHA-1: 600d11c128664d85f62cf6aa6d177ebe610ec602 SHA-256: 759eee17262fc7b36297b9ccd87774a369cbced677aff20af93bdd969d318abf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially harmful websites. The presence of compromised CMS upload links and disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=football+manager+handheld+2014+apk PDF link annotation
    • http://ddservice-bmw.pl/userfiles/file/puguluzogudozegi.pdfIn PDF document text
    • http://silver1979.com/upload/file/kebukupiniwanegitef.pdfIn PDF document text
    • https://buka.ru/sadm_files/54811682963.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/20990127349.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/texagulategesufadu.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/22091169328.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13166083086.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630466993nobowirixoravisoweni.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b3cc782---71249464805.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/84391821149.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8b57ef2ac---rudavij.pdfIn PDF document text
    • http://immopolignano.lu/images/fukasoz.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/52060624876.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210921144528_yprgcd.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/55328219647.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/liwabutodotologi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/27368576689.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/62653482735.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/28232680691.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ca17a30f---dutadi.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/37607797487.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02c9c2161---juxami.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/lodesalezijosi.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xadadoxiripezid.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631319121.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3ebec72717310ef30bcdd8bfc466f7ec/nifegigiwipazir.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_off0000bc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC37 11160 bytes
SHA-256: 0ebd931a3f066709b05157f0d1882f6fc2a8d4964b63100fd40a1f98d4ea1fe8
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 19596 bytes
SHA-256: f3076f3806d49c8102fac5060eb890d831216729baec6a7d26eb0ea43e2ac70a
font_02_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1