Malicious PDF — malware analysis report

Static analysis result for SHA-256 21765fe9f036de33…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 17:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1964da43d6b0fc7e99311695eaa410b3 SHA-1: 6df4b7cd6fdb40b29b9bb76b2d9d0f0f60f3a8dd SHA-256: 21765fe9f036de335ef2a7d274427a0110d5e424d19adcfa944e6cc5e9192462
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous suspicious links found, including those hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fk98+watch+price+in+pakistan PDF link annotation
    • http://antonio-pelella.eu/userfiles/files/4304235553.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/bozes.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/80792059405.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/vanefepupizokowekuv.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fesosufumasewemuti.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/madino.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/aeab4d624f9482faa6f53b63a6e56d4b/fakiwuxirelaxesinis.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/51879801280.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/daec78d6172b8590b661c2bcfff297ad/91508427854.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/kaditulejikitu.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/subalizuvi.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/fatamefajezuduze.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/sebumatonififesapuvedujoj.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/60887374223.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/pupevadasadapobawafobuno.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/fivuxulamusobaboroxutem.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/dijemojemosamilib.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134768b7d263---14049736865.pdfIn PDF document text
    • http://talesma.com/E/file/motofusabud.pdfIn PDF document text
    • http://sswjeans.com/files/nobekawojodomerojotoru.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/rupamadigimeka.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161456564c36e3---logez.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136692244bda---77003596496.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_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 19404 bytes
SHA-256: b396d0b3804b9f1d921805630528eadd7acfccd9ae87166e6d8c3d33c58027df
font_01_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 10836 bytes
SHA-256: eac959236d8c63d88e6d199f49225d618c3aa3b4d4e7ae9da3f1b287a11c637e

Open this report in the interactive analyzer, or submit your own file for analysis.