Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdaade10139f14a…

MALICIOUS

PDF

78.0 KB Created: 2021-08-20 21:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee2800e0a780ce43a7b68bf873ed68b7 SHA-1: f835f49c9443896fd39ee0c544bca979b4aeb2e8 SHA-256: dcdaade10139f14adef1a65b67c2a2f6e2bd57bc4594117913a128e4b38fcd98
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF acts as a lure, directing users to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/uplcv?utm_term=barbie+%C3%A7izgi+film+izle+t%C3%BCrk%C3%A7e+dublaj PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160976e0d1e48c---notipesuvibemakobe.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/76645448340.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/gixevexofuxoxi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jq83tumvooebb8p315i18blba5/41443110519.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/ralisalufidolin.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610d44c11524e---latexiduvovejebitibexaxiw.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be10ccbf6c6---84029494784.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/cbaae8bb9a16703197db89e80ac27a60/mutikedezip.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/fuxemedu.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/zopalokexujekapevex.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pejifabuse.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/dorazemazugoramodowaji.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/75755849618.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160761699876d9---61061895819.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6757a6e9---rasifafoxomum.pdfIn PDF document text
    • http://lblussana.it/images/file/12261292672.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/fokunakaxejemo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a23cc11388d---25605858968.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/1530334764.pdfIn PDF document text
    • http://tms-operation.com/upload/files/pukodaduzivijelamugezog.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751cf57a9ec---loxemufi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb4105f45---nomadipo.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/powuremutitiwozulegej.pdfIn PDF document text
    • 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_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 11272 bytes
SHA-256: 451bb654f944a99804b24795f89eb5f73051e229361f77a2f1ef65f5f7602ca3
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 18348 bytes
SHA-256: b32b8b2f025201d6ba4d84d66a7beec4d88db2a4e425d5bec2fe01de352f68d6

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