Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cd506421e29725…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 06:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48375210a4c1f5175a9feeca86c891d1 SHA-1: 9fcfdfd833ac8e1a9fcec879b2e1f8329c49d7e9 SHA-256: c9cd506421e2972509876ebe3c5edce08dbf3ebffa430a49a7207dea9d6ff742
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2b47b57a---11352350816.pdf In PDF document text
    • https://renewone.de/files/40508651481.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/5804540895.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/68144211749.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/siropopubimaxupono.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/51020362195.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/98232018904.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1482f12a---90302440600.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5556b1666---gidojup.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/3121266129.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/nowumu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3399e637---jexavurubafibomapetako.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/gabatadik.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69036722853.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/mowujafawagulobativu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8d8a3d71a1dd0ff0a3ef896caa9af2eb/3388309314.pdfIn PDF document text
    • https://eternalbliss.net/file/13094570642.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/reduzopupivowapepimur.pdfIn PDF document text
    • http://prota.ru/upload/files/71593923128.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/54834707225.pdfPDF link annotation
    • http://didula.com/img/file/vunogoguvemaka.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/jizewobokuwikexe.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/8538408762.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/64327698792.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/84850582454.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/nawiwawefawojabujoruli.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/85063371513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=super+antivirus+apkPDF 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_off0000c4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 10412 bytes
SHA-256: 84a5432f1a11da5f3efe2b1cf2c2247542bca17967e622b980e0b735f77fcdf0
font_01_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16116 bytes
SHA-256: fb494bda682c01e98291890617824bf9b64a367b34b6b3e3a30d939c2b8f2c52
font_02_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1