Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cd871824583bc3…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 01:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29565da12c95ceab639935b24c2a13c SHA-1: 35a8940678ef85e8bc914f07fbe0be3e6b46951e SHA-256: d5cd871824583bc3bd899ca609279d2d764be7d885ec238428cbae2ccab0f5fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=what+to+do+if+your+bored+at+school
    • http://barsugo.com/ckfinder/userfiles/files/zoluzuv.pdf
    • http://agendatourvietnam.com/hinhanh/file/jawizupumanemanupezodono.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c1917d6a22bdac432f7a8420c80b5810/65823049045.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b31c5ccb---zikosagiruwuzuf.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8419043475---tetodanusuboso.pdf
    • https://schmitz.cz/res/file/86427800606.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8b18356e---newuberusolafowimik.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bc2b97ba16488aa74d37c40c9db6cc6e/gapewoguzoginerizu.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5456cb21e365a74eb5e651e0c4a915fd/dobatevepugulubuz.pdf
    • http://teranor.com/ckfinder/userfiles/files/bulesifop.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8a5c02f4fdf19f0a9a6c52a5cc2a064f/ruwaneluzidizoj.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba7854019c---pidetabowamavof.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/55q2nemu8b2de9ur9hqs24l2fv/90608216288.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d65522db7---25429026910.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160878e82374e2---69718446081.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/dewexakanomulore.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6ef956cc8---jibof.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/476848c3fa17c358e5639f72b93fde17/10817799160.pdf
    • http://ya-ke.cn/admin/upload/wikunuwewibumiliwitora.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/97913166708.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b46385dd---75452462929.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/9766468749.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e5.bin
746685dae0a083c60d214cb6f7422bcf2e9f5b637256b16af78a41a74e8cc3db
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 10816 bytes
font_01_sfnt_off00012107.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 16792 bytes
font_02_sfnt_off00013919.bin
c14cbebb01fd17b041f4948febb3c16ca80f1a500c0d8d6f23cf73ca4c3b2533
pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 17628 bytes