Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e121ef6a422a9c5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 07:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb58a5cdaabfef3ec6a6b87cae92a7bc SHA-1: a0c8142a8073d99d23f748bb8d74757a587dcdee SHA-256: 4e121ef6a422a9c51948e34094e9ad7715f17455fa4ccf0eb3bd343420b4731a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature, likely as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://synerhu.ru/uplcv?utm_term=video+editor+android+open+source PDF link annotation
    • http://charmingcurls.se/upload/file/sejazixogarajevopezujat.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/zunikupobuwor.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/fubonovizoziwev.pdfIn macro / runtime command snippet
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe959e5ee6---36528441655.pdfIn PDF document text
    • http://nktrading.qa/file/files/55814480454.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/dinefan.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/77263584565.pdfIn PDF document text
    • http://thevalleytrader.com/files/laponojaxa.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/talix.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zubilapuzopem.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/kifukobosusuvuka.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/avieesm28pn8c28g3r89bmnf65/3013718570.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/48776659557.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/24051054063.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/66209426580.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/30216439967.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/59092924651.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/60235298528.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/pitozatufolulelujivejup.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/zadozezipufet.pdfIn PDF document text
    • http://indemo.pl/Image/files/rojapejavejedetofafoz.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/wevida.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/xesapasoliniriz.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/84640347775.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/37671151407.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/35458333081f9bbc72ad7e1112c829a9/tufepezetigimusaw.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10528 bytes
SHA-256: d9be68973f01b3e94474654dc6d09abf17ac50a8f5ee69f4be4a08b571f9c64f
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16648 bytes
SHA-256: e33d1e897cbb8c06730731d6fde1e5ae0dd7b3be5318b3ea250c1d89947c343d
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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