Malicious PDF — malware analysis report

Static analysis result for SHA-256 568d41d28b0c0beb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 05:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e7cf17d1289401154d68d0c68800fbf SHA-1: cd41da9bbffea69d2a25c48aa8e3d4f55cb85029 SHA-256: 568d41d28b0c0beb98bc836230577e5ddb47f9052eeff05f8c48c3391d8562ce
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 compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/jimazijuxemilerelo.pdf In PDF document text
    • http://dydlhx.com/upfiles/file///xadovezazadurapuzozer.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e57bf77---7313705869.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210906031628.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/41805019608.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/34340820265.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/zanumezoxiginef.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/sesiti.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/luzutukef.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210905220048_160813668.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/rizizimujalenesovofefiki.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/43279958061374b32aa2b8.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210908021025.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zumuvunugonezekoritileb.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/sazupifupawowotozaxaj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353a646213d---1816669492.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lukasuk.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/90212217016.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/67934038942.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/85p7t4420h7itdf98j0jrmqgtg/sajadajadolizokowijal.pdfIn PDF document text
    • https://kaparatt.com/images/File/wifalajaxu.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109082025099007.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/meweminapufijexuwuwam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fall+guys+online+game+freePDF 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_off0000b939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB939 17236 bytes
SHA-256: 59abb17a9250b9fed9182f159b475c242ea3a74483212c9c30dccddfe71f9553
font_01_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 10652 bytes
SHA-256: af231e8ccc3dbc2b75548b9659bd95c66d2e7ffcc3e5fe44efebeb79ee45b421
font_02_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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