Malicious PDF — malware analysis report

Static analysis result for SHA-256 4263891bc6dd5c22…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 20:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86a0d22f94eec9202a4220f0910b4aff SHA-1: a3a0dadb54b7b7817d8f592c774c0b0389f01675 SHA-256: 4263891bc6dd5c22efa64a28c05a8ad2edc8f3e4368f9265f19298866a16ebe4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4cdc0c976d806019b565d48877773c16/1562426693.pdf In PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/guzavelasutefigij.pdfIn PDF document text
    • http://hongdacable.com/d/files/bunuj.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/353dc99f7ea7858dbc819b5a8be0f309/wojaxemidibiliki.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec4d9a8e0---68633768135.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/dumelejorideni.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p599qbtlnohbff3l04d71effhi/41999121579.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8a6cbff51e024c869935fa48fb9bd072/suzidotegupovefa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b99eea03---99426200726.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/37105850090.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lerikelolefolanojavo.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/pawim.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/87836325917.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/gekaguriwagapi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de0f46443---99741942986.pdfIn PDF document text
    • http://skupka54.ru/upload/m/fasova.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qbid611g3gtfntfj2sj3rbvi6/vukudodi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612a359e14e19---vuzifepebofoxi.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/97019742422.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/mugilulab.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/eimgcoomta0f80te276ph0guht/3478156144.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/24883783348.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/jezatabesufepijozemigukew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=linear+inequalities+formula+pdfPDF 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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10864 bytes
SHA-256: b5718eabbb2c95a6c532c022a9898f61f941760cb4eb54108256cec66d12bcb1
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 19076 bytes
SHA-256: 4c45adb2837fbe0986e25d82efcdf3f578b50450f678b5e96468cfc699367f04
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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