Malicious PDF — malware analysis report

Static analysis result for SHA-256 857bc284ad8c98e9…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 04:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d562344b99d6f0b1f11d2e8e62ca67f SHA-1: de2676100155bb41aef2dee507e878ebd407ac6f SHA-256: 857bc284ad8c98e97a974687d2291e0e06bd409131795ad733f5d4dc340f20bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/21d6e251df8daa253c03cb928f905424/bomukog.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/mrgdik9lal00avjfq198sjclg7/kakusepotesixanelusej.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160897e8e1514f---xazidojirupulidare.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/eff43bbe60afe9cd18a5d90e4e556b4d/31117683078.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/16038617145.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2e1d3841---93869567474.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720e72d9d1b---soxemagetokamagogunelebe.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fazoparagamizutipeju.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52228542235.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/jetoketuva.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021082609135773499.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02d997de4---nebed.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/29692299748.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/43011173805.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/31170150719.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fadujugajavanepowanaw.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/1236294055.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ropelezudoderumugul.pdfIn PDF document text
    • http://pk.mo/userfiles/file/85927354773.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b72967983cc---87422370848.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1af2e1974d---54335660288.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/90f3d07e42e252f94dd62ead921925f1/xonawamemugikini.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/lewalagugabeg.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/vadigijefozisimuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=important+dates+for+competitive+exams+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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10856 bytes
SHA-256: 895b4a7705927f8e51bbd9ee19910b861a11fdbb2b78819e5b7396433a60c0bb
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 20008 bytes
SHA-256: 9e10be00d5dee0adf42e42351ba507ac2c31b24d287545d57eceb76cc91ad1bb
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1