Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a22f61b9051142…

MALICIOUS

PDF

77.2 KB Created: 2021-09-15 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2883d85320fbee5cc58e2ceb8b221033 SHA-1: afb1a2240283d4b6d8f69ed723793b40d7bf6e54 SHA-256: e5a22f61b9051142fa662c651e58ee7796f19a1fdd875bcee292574f94fbd196
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links are presented as a link farm, likely to obscure the malicious intent and evade detection. The embedded JavaScript and the nature of the URLs suggest the document is designed to trick users into downloading further malicious content, potentially leading to malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=download+game+naruto+shippuden+ultimate+ninja+5+mod+apk PDF link annotation
    • http://soles2walk.com/data/file/weganurovetopujekokuju.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/bogeginisi.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/ladiw.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/fulibojakutebosiju.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/supisumojulimuz.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1656b7c30a6c1fd33e0420153870e8a6/10803743310.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402408b0bb6---sizezizufizanuf.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/wizukejukitetonipelaraniz.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135372c3c47f---budivagizopajomububififa.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/82048792369.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/57905822118.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210904180636362.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/29754539387.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/27418178208.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/vulujaruzalavowedero.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zuxefaketefar.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/66529178385.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/896278361cae941e1112681717748e4a/16220081976.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/70237826995.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/86994567246.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/nusawa.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_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 11384 bytes
SHA-256: ca43f30f8cb878e223caff8740913e9871c0e2933904d86d6484b41bbd652fb4
font_02_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 17340 bytes
SHA-256: a7aef6d8fe54148d4d9c0801b360e74f76ef5efa8b3eef3e6102fed20704f7af

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