Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21a277c4da27857…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 16:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a71c00e0d16b8cf453a1662523da256 SHA-1: 0bff69dd3a6a211f7877c3465bf805d074f57a10 SHA-256: e21a277c4da278579f9ac0daf5fe0c8e2fa0b37702f6aa5d290917ded7b527a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://inwebjor.ru/uplcv?utm_term=how+to+rename+firestick+2020 PDF link annotation
    • http://ldksolar-officialliquidation.com/userfiles/files/zigefojinewovenodefamu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417084b7824---29159716907.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/muwas.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a06906df---23655150.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/sudoganolugemoguzujife.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/73528587071.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/mejegalesotel.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xafamirotatujikej.pdfIn PDF document text
    • http://imaginove.eu/data/Files/dasoxudufekowuduzu.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210909110910807903.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb7441ab36de62f4781d8c71a2b16686/woxolawabo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/baguwuluz.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18900b348---fagalibilit.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/31904041274.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/67607159082.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fevubuwetomapo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/74340250216.pdfIn PDF document text
    • https://dukupahit.com/contents/files/saworevixamenarawimosamax.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/17513849081.pdfIn PDF document text
    • http://djpress.pl/Image/files/rokez.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9a2e7fbe---18217384749.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lebavugavakotir.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/pexiguxulenajejoxixujoj.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/81121499352.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/xovusufopiforaxe.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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 10864 bytes
SHA-256: a7653a9740df789f7fae6ed18c7972e7fdf594403f5ac3afa4f2942a93561b0c
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 17652 bytes
SHA-256: 46cab3bb0d681dca8082e82c7d5577c90c2df185d251048512381849cd87cb41
font_02_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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