Malicious PDF — malware analysis report

Static analysis result for SHA-256 7994a7f2dc02d4fa…

MALICIOUS

PDF

75.5 KB Created: 2021-09-24 18:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd6405dc81cdab89007018d78795db3f SHA-1: db2f11e0c51f84b4e9c6b275c77211261281a136 SHA-256: 7994a7f2dc02d4fa2b80a75b6283acc643dd2383ef21ccb5611dd78fe95f9665
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript is likely used to obfuscate the links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=the+basketball+diaries+full+movie+123movies PDF link annotation
    • http://dj-maily.com/uploads/pages/files/jejitiwesik.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/bipilapepazefaleforopit.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/jerurexisupakutadibibeve.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/68839420818.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///neseloxevusufamojanuzised.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/56974908852.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • https://sd-olimp.hr/files/73760934116.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/wuwizelulunupew.pdfIn PDF document text
    • http://guchen.ru/d/files/47046044459.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/57460507792.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909235115.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/69699604418.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462e10992ee---29457737197.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/57475595905.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/favulizezunozovi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4961411bef2330dc6ddc5b0c8dc6297e/rusexukevoturobojup.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/1967149122.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425086b2032---35570093027.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/zirajoroworalasurakapuz.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/budigogasakatag.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3a7f299c6c9c45692e25951834ab7740/winodil.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/76811287251.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/ziwiripozijawosarawane.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_off0000bde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE4 17728 bytes
SHA-256: fc3e193af5ca3a5e07464a6d47e01ba27dc043708d9543c50c842107736b829d
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 11220 bytes
SHA-256: d16a6b50e14515f0784f958f307d5413b87df866d5539b23d25b20afc822bcd2