Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffad1deb0a062ae…

MALICIOUS

PDF

77.4 KB Created: 2021-09-22 14:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43ff35fee785c32f5553865b3771d337 SHA-1: 5531040a5d383ecaad41594ca1b195721520e7af SHA-256: 4ffad1deb0a062ae6b6595d415e3a40c984b20fca28ca41216cde3778a179311
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream further supports malicious intent, likely for initial redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=friends+with+benefits+movie+live+stream PDF link annotation
    • http://cee1968.com/ckfinder/userfiles/files/37141632288.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/xikuxadufutusezajet.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614045b308718---sulutelakakopej.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/11373239111.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/dotasowegegugobuwazafufu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/losenazugeruzebivezakejav.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/viwudanikinuzopon.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc778a575d---17848662248.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/newolakanixafi.pdfIn PDF document text
    • http://kasand.com/userfiles/71326987248.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/56021416654.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/89750245006.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161464700097c8---89745430943.pdfIn PDF document text
    • https://scalper.ir/data/files/file/65502266178.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/73399056670.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109050401378564.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/9788757820.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/madadovugesivisoleroz.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/lanideganerapagija.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/10218759832.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/63783198773.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/238r335g2n067u5topmiquhjk1/51398737705.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/67781436049.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_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 16932 bytes
SHA-256: 5a96121064dbd23483a078d4be87fd89848c2c8ab6fb5e20954e0287838b0def
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 10888 bytes
SHA-256: 674247aa4bb5211874b1aa26277eefb49aaa1ecd7008c493a0c5947504d87b56

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