Malicious PDF — malware analysis report

Static analysis result for SHA-256 606bfce73b803a1a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 11:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4e5f42d150571fd7a16af76eed5f0c8 SHA-1: dacbd1c006995f9036388a06dea282b65f0fb305 SHA-256: 606bfce73b803a1a7d407190fb6c9882ad9b16fec974eeb19c9b7f78bad88475
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The presence of a link farm pointing to compromised WordPress uploads and other domains suggests an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laps.pl/userfiles/file/rixoxezo.pdf In PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/lifutemoreku.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86510489179.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ba726384---4558107026.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/39530405471.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/pumalivizemegejapefebure.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/kopizuxebiwape.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/kawizigoxebamig.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/norugot.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/57640148288.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/83885248609.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zevubuzirovubiv.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/jibiwif.pdfIn PDF document text
    • https://interconformity.ro/images/file/43314140311.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6660be672b209301235a0bbe7460776e/logaguxojozov.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/polamusifoxade.pdfIn PDF document text
    • https://ijp2.com/contents/files/21294527968.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/valexivikatominaziluneg.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/63636581297.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109082156428778.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/leradaxetofiruzurodimozur.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/budodakugufivuzufizod.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/3121698677.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/xabimovovodazufake.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/musosazosibanofaletige.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaaf9d2269---31014821632.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613557a45b820---80056031043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=banner+ads+in+android+studioPDF 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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 10348 bytes
SHA-256: 1a917b301eaf1da52686c24c3c8834e5f645ed0da7694c23771a57ecc5a0067f
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 17928 bytes
SHA-256: 8289d5bc037a007f6bd88a1d7acbc42e3a387f7d5305649f5884defaf2f1e997

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