Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8ca641e9046d5b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 04:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf4596f1f92bd5c90af4d0456c1273e3 SHA-1: 4bf09100eaa00757fff0eb175361dfe6ee7baeeb SHA-256: 8e8ca641e9046d5b9f0b46661d1be4c03ff5aeec1447c872b4c7e1f1de69592b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=blocked+calls+list+android PDF link annotation
    • http://montex.pro/uploads/userfiles/file/28062417581.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/33236056332.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/76251719798.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/79237076182.pdfIn PDF document text
    • http://mastervin.ru/files/file/51483742000.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/90a31e31cd855eabc9b51e1f0eead6e0.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/81381688516.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/nugeza.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1da96c7da---romekewevusana.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/zujufugevonup.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/43458409905.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/30221214990.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/rebakuneromudodilegame.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/kudakejefagiweg.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/nosexuvof.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/mazinumaweruvekojowi.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/6462745927.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/rusegolujomub.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631037667.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091012203773499.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139653311695---ratefiwukuwudim.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613210deec1f8---mavomuku.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132798605cc5---84601725304.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161329e45a89ba---nonokedo.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/15065947771.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/72895133625.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_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 16660 bytes
SHA-256: e436b1a5216688b54bf41756c5e9a884f4162c0527aabc254202367a0c908227
font_01_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 10508 bytes
SHA-256: 8cc975a15a87fb844caffcf62c414797ffbb85941f1293391ab03ab7df2feb96
font_02_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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