Malicious PDF — malware analysis report

Static analysis result for SHA-256 a766d2c34cb133e5…

MALICIOUS

PDF

96.2 KB Created: 2021-09-02 09:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a783f934655e3f9dd5df574196529190 SHA-1: 70224c6197841d29740d02f8634d20289b085861 SHA-256: a766d2c34cb133e55791af8e8d2d6bfff09d545204b54863d639f56c74e7a600
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary URL suggests a lure for downloading game-related files, likely to disguise the malicious intent. The embedded JavaScript is likely responsible for redirecting the user to these malicious links, facilitating the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=the+king+of+fighters+97+apk+download PDF link annotation
    • http://ruilong-ironwork.com/CKEdit/upload/files/71647079062.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/99324749919.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44733b135---wibikarixudosedawuw.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b74d107653a6b377bbc035c0aa4c4047/nekupitikokad.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kaduzal.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/51a392bdca71cf02a5fda43a809a089d/28564603190.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/21485633510.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a518d5aa771---18257984854.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/6956853940.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/sesogujolexekedexubudetok.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acce72703be---ketewu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/31057456580.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076f03831683---22257065344.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/juferazip.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/92316569254.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/39500241fee7d5b3cab0192685221d25/xigagem.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/63727702927.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/48214992586.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/91981851574.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/51392165071.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/23532543529.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210813_3FB1E5E9A9278B3C.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/perogatobi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477f6c979---79555179178.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc5ec4a1e---25908362687.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba78f67e88d05129bfdee2d96eac6d48/nivugafuzirojura.pdfIn PDF document text
    • http://veitali.com/upload/files/gonujugerewige.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_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 18236 bytes
SHA-256: ea39c2da1328c7b14fa3860d184d919ffdee5a63f886a94b8575033b91583239
font_01_sfnt_off00014051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15868 11136 bytes
SHA-256: 06be7dbb1670edf656dbd44cf66d7db8ea5646cc19329d68b524a593a20755bf

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