Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f92c15c33e46f13…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 08:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 559b50ca95dcda9babd4b114b27f4f57 SHA-1: f37ad5dd72368ff6543c0c5c65432b58f0bd1406 SHA-256: 4f92c15c33e46f130366e0c96ca4d24674b11fa9047380fa7387192a2f034c27
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, likely to host phishing content or malware. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chachachat.info/js/ckfinder/userfiles/files/jifudetidiwowom.pdf In PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/guxuwevujewebazegugobiso.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/48420458362.pdfPDF link annotation
    • https://cyc-catering.pe/disac/userfiles/file/95160162294.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210902024225.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/letubawojepexixebimuwe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d9b21ca4161d602a383d649f5118d750/59475022439.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/32126317798.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///52342372273.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/diwemozitimeraxuxe.pdfIn PDF document text
    • http://wsm.hk/images/files/91945027107.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/zatoporunedinogelat.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/87949869524.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494542f68e---soxibuwodu.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/5050064581.pdfIn PDF document text
    • http://sbcnepal.com/images/file/xejabusivit.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161430b560844d---famuwegikisirijabiko.pdfIn PDF document text
    • http://remobudostol.pl/pliki/rujupubuxitowufavilotu.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dutazesirone.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/93392873195.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/60482540711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+quantum+physics+of+time+travel+pdfPDF link annotation
    • 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_off0000adfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 16400 bytes
SHA-256: ab60e668b216c9d17daba44910f9ecf52e782f83d7ce5cb7098733850f4206d4
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 11276 bytes
SHA-256: 817e3f0fd2a54ef38b48a42b05dae83e80ce4ee6e73c92871325ad8c45d17121

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