Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cc064c5117d299…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 02:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10137b3b6a49b9562abff701b02d0e5d SHA-1: ce941140df0e504acce1f8d40274159d0acafa5c SHA-256: 03cc064c5117d2995bb17e7d9d4a6968d0b7ace46fd6785b0c7fdf5c3e6c9ff1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a WordPress upload directory, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://rakowka.pl/userfiles/file/zomisudimawamodufirem.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161391850db978---13228783544.pdfIn PDF document text
    • https://bunianco.com/other_files/File/gakidexurirejivo.pdfIn PDF document text
    • http://mp-journal.com/media/file/ligoxuzedupewarorop.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/12458386769.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee0c74a1f---lejisonugusexe.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovukevukowitozojoje.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/nototaj.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/lemuruvuzirejogebijas.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46933714280.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db59f2dae---94438045699.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/30206590257.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/vusudapagiruzemokofudoxoj.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lefuroxefojivixaneludok.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/numunabumisudekiwudi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zoxadinimutokit.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6m3uv1lfphjia4debuej6kb0g3/burijuwiketujitulesu.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/32744675543.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/41922965531.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/12555316106.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/55165249315.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630916478.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/xivalibisuxojavorozesade.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xokixudibejusigu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130401569d2c---lopizaz.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/selixenafezopeguxusa.pdfIn PDF document text
    • http://opsir.eu/files/file/gizugujugofigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=backup+data+android+samsungPDF 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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 10924 bytes
SHA-256: 27de28f00677540aadebe5914e8c9b01a33a03963895f0f8a4fdfc74da1789a8
font_02_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 17392 bytes
SHA-256: a943906047380b92b3d60459249cbfb7072f37395c6cc9ba6f8003abbc1463b0

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