Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4dbbfcc404fbeb…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 18:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf5189788c2256491cfc3eb78a38e36c SHA-1: f9082d7abd1e9300fa48b8808e5aac893e466822 SHA-256: 7b4dbbfcc404fbebb2d6dbc056748f88bf2d85ada311baafd90a923bfdd7f05b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=spring+boot+rest+service+tutorial PDF link annotation
    • http://4chan.ro/UserFiles/file/55951363523.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db2316a23a---xaxageguwetuk.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2b70da6c---gariwefezunokuxonotimupi.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210923_185057.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435e14c82a8---54775090978.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109040522529185.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/xepusukegamukupor.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/1626093605.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/55197496716.pdfIn PDF document text
    • http://eko-uklid.com/files/file/xunadiletixofidum.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/64553432934.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/172039287437.pdfIn PDF document text
    • http://apicn.net/upload/files/rizatip.pdfIn PDF document text
    • http://silver1979.com/upload/file/48705586428.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/1864218049.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/76067180327.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/28538440170.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/temopopezupafulubiwebapu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/japoliv.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f810717072---bujalekipimaje.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/96989483540.pdfIn PDF document text
    • http://dentherapia.hu/files/file/2549332818.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/mogiruvajolajoxejawunutop.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/62684009348.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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 17496 bytes
SHA-256: 54ab096436213162ccf4c0a071fab286008205463ee9f9b36b6bdbc7d039b4cc
font_01_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 10932 bytes
SHA-256: cb85a99ef867ffc8dcadb1d384344050b48c8b8e67935178334e5f15819d7584
font_02_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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