Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12a2a534e974780…

MALICIOUS

PDF

73.5 KB Created: 2021-09-28 10:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 040a3437210c39155d2d352a309f2472 SHA-1: 37e9b2562ab1a030a74e97c3892d579319187856 SHA-256: e12a2a534e9747808acc228390271d297f63e75606e0649be9229ba40a7a8b6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, contribute to the overall pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa7bafa5be4b8f4ee745d31f5cf7e486/mudafaveriku.pdf In PDF document text
    • https://zhansq.cn/upload/file/72064655854.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/nuxiwejanugixivesikokiko.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/kedafivatage.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv8tmkqoq1pvkbr3huqplpb4hn/rukeguzomisalekajipixu.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/54772324044.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/boviri.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/lifiteba.pdfIn PDF document text
    • http://usagimatur.com/files/others/ninapawajug.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/gokixovevedafekitu.pdfIn PDF document text
    • http://vodova51-53.cz/files/vinetodugixatuvobezor.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/14668555863.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/42963972041.pdfIn PDF document text
    • http://chenruichem.com/upload/files/kisofalagaxinonuzij.pdfIn PDF document text
    • https://gilbertems.com/videos/file/welikotuwuwofu.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/joxitigoxodolukarawuguv.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/ginugomalod.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/pobisabikizovixef.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/suzopur.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/bawepexaj.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a88fe8c8b---68917247505.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/67301726820.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/23627923140.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b731824f4a---67286972405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fake+text+message+android+appPDF 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_off0000b89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 18100 bytes
SHA-256: ffdcbf1d99f00e1c5eb79429ecf62dcb683e1e7c04965a1c548b13bde76817c4
font_02_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10860 bytes
SHA-256: 5357d8832827b06b8347e995f967c79f5f2e6ebb001ae19eb8b9ba663bec6976