Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c3a3dbc5bedb30…

MALICIOUS

PDF

101.4 KB Created: 2021-09-03 00:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff878f9cdee5189171717a9f5269fe5f SHA-1: 0673c4514a167ef1dd5316d14a43bb67da888d05 SHA-256: 44c3a3dbc5bedb307af7f8edaf0c53a2a4b0da15d64856b77bc3fb11595b1a7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

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://huntic.ru/uplcv?utm_term=integrated+circuit+design+harris+pdf PDF link annotation
    • http://hzjksj.com/images/upload/File/48710388976.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/43264683289.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b37ec6875686bbc7df23bf1035b9d795/nivuniwutijebe.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/sifusa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16072395b6210c---44176818843.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609715a469977---foxowof.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/dbab6bb2ab2535515419ac64a8c3e60a/vetogofos.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609406d68f69b---wetixobujom.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22dcfc9ab7---82066092209.pdfIn PDF document text
    • http://hydrem.ru/images/file/bikok.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xumekolun.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/n3krsfvc3vc8r1anc8quh5fef7/gelixuruloferawakomub.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a3c995a51a74c86bc30c57d563a21ac2/32884853319.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/memirod.pdfIn PDF document text
    • http://oembag.com/uploads/files/202108150311489853.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbac67e0---12822942676.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/24782796528.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/bawivov.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/15512011656.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/s015440o8rviqf2hismgms2hi1/lenoguxakikiriwudo.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/dupazudefu.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/99097105336.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/dibunerip.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/97826455165.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/mapenusavokakenujatimadot.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_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 10784 bytes
SHA-256: 3ea06805aa477626d6df69aadc6fb799b08d41329f88582b0435955f81e31acd
font_01_sfnt_off00013f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F31 18292 bytes
SHA-256: 75706c45ace0a0765d94d455096f882a31f5c497f658178abbc490d441dcd1e0
font_02_sfnt_off00016f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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