Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0b7538a679354c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 18:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3453e0ee5c83c29b35383e6a2ad614a3 SHA-1: 202773691d587f5bf7242587d9492837d6fe6a3b SHA-256: 2b0b7538a679354ce1ce5cb8fc4f3eea7ab911d91349c77465d1c68a2d5908eb
164 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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=how+to+crop+a+video+in+android+phone PDF link annotation
    • http://hibertek.com/image/files/20210915_130557.pdfIn PDF document text
    • https://petikdaun.com/contents/files/gogunisepipozoxopofuli.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/ximilos.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161452fca3c28e---78393138454.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/bufopijedesetado.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/tivuzodubezofaroda.pdfIn PDF document text
    • http://jarosi.hu/files/file/zumotobo.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/11675537052.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36aadc73a---jijunidow.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/19513978909.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/85131114900.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7142364b7c93bac08a511a47cce9e7f7/89668057052.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb30249d8---liteza.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339e42749b5---4160252391.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/51497972055.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/rejozuzonibas.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ecca72503dbd4b817141a3e7ae9a2e8e/kivukavatuwalofeni.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210907_013203.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/35316623462.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161412ab7ce03a---76606939890.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/nokena.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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10540 bytes
SHA-256: 04cf866dea3263768f48c59918b3754552ce4c41fe4529ef88c4d49c00ffd74a
font_02_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 17832 bytes
SHA-256: aafaa8ca3724fbdfc4a163b06dbfb16bfb95b5783f1996e8dae4c63d966b7423