Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9dea10b6b43cfa…

MALICIOUS

PDF

118.7 KB Created: 2021-06-26 18:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 03a856995cfa171dcb44d485410dfa42 SHA-1: baf139ccd8841e05a5101fc7ac1457f4ee7bd14f SHA-256: 0c9dea10b6b43cfacdcf55eb1e860bb4c8d3ec71eb03f4c75391aa106ba11b8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is likely used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/l54uce6n3cu4t453a7008ttt8t/11401788379.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ef89d743---57120179329.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/nufiwin.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/80d9488f98a7fd220a79a62497f1c458/wutitewimat.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/436e86174d4e68387a0f3ed3c5e8f10d/xuwalax.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5586f227---46990944404.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/81240453167.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/wajegadibalokivojeli.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce9552d0d---dirurevufogas.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/rakuzenonobabepobe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082da0123616---zeruteb.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/lijmq4bf5nho7hnlau0i5bub25/68658668044.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/boderiwakob.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/rejorizibu.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/951109987.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rqi129v6hum4ufor7mtf2vov1b/78596612912.pdfIn PDF document text
    • https://go2germany.ru/files/file/vurunamasese.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1f52fafb---30347114169.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce253f3bdf---kawukusemumepitezaxar.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7dff54c28---9075675266.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/27790976134.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5niin4mrsvcdg3a9db77lfson7/vabidiposalilunewi.pdfIn PDF document text
    • http://yepsell.com/userfiles/files/88628476475.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/565a2a03fd125251494ca730d029d0fb/31363475450.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gg9gpai710265ea3b0js99au2h/kijudigok.pdfIn PDF document text
    • http://splogservice.ru/content/file/19146074143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=scripts+in+artificial+intelligence+tutorialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000173af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AF 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off00017c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C61 20372 bytes
SHA-256: d5c394cc4ab005234298f234e93b01e81a3aade6782bb81d3b3c7415d250d616
font_03_sfnt_off0001b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D5 10828 bytes
SHA-256: 886d0cc24b22116d8f4fd0b7003a94743b01059e19171a66ac0368cc26351469

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