Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2266372de92170…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 18:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f544cd3a28df68500aff139da7f95c07 SHA-1: 896f8e84bfe0f597ec3abc25b187762d0b3de6f2 SHA-256: ef2266372de92170d27239ace1dfda27e2980f54d0e288dceb464a9695cc4ff1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various domains, including compromised CMS uploads and disposable hosting. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://partner-support.net/user_data/userfiles/files/56844694781.pdf In PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/66497363863.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9177062d7701da53510fd9f8ffe1b0cd/wuwokuxerenub.pdfIn PDF document text
    • http://elsped.hu/files/file/madanutug.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_141552.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/57752471408.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/zilofosebozokuvam.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/98132752879.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/45777973254.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/koxawukivamasol.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/jezelakazunamidevuwi.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/kurufurojofibijujotebuxep.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad811ada54---22789290462.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/rivumijunegopibene.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/suxabexul.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/tujaroderazaf.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/begokiguxopo.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/lobuponobuwozuv.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/figopobik.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/6724720110.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/donomiwonalaxew.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133897e52dce---mesegidigo.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/74704868850.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/nolavisujetul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=flash+root+androidPDF 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 10188 bytes
SHA-256: ecdddac9f847de60addbe917179aa922efb23ab0e078a634f6c4088eb11e3b40
font_01_sfnt_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 18692 bytes
SHA-256: 9ef38691ef0bf7f5bda295b347efcf936321a8d3775d146352191fa87f3eec00