Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d15573aee34110…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 01:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a89d30db28b6c23f2b724167b4f84532 SHA-1: 890c09f97ddee22329647793033d52f29b87ae9e SHA-256: c0d15573aee34110cced2704c92591280b7f8b3eef030b1ebdd36b5ecd1c5ecc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with critical and high severity heuristics indicating a compromised PDF. The presence of embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely serves to execute malicious code or redirect the user to one of the numerous listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://laborke.ru/uplcv?utm_term=how+to+free+up+space+internal+storage+android PDF link annotation
    • http://kppzp.pl/userfiles/file/82099293009.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/gupul.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/sidijovugugotunudabokutej.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/28428739231.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-6/20210906064740588219.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614077ad681e0---44432942341.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/gonemujobotukajijule.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/28979779726.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/71270481616.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/23234057110.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c19018ee---13772092051.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/tizuwazuvodazadojosuduni.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/37651815000.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210916003458.pdfIn PDF document text
    • http://strandedtattoo.info/file/vogorumumojalere.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nugetuwarel.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/4766709988.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/sixobodabipupinesadu.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/34818702468.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/47678821863.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83f779a53---kirejofuwonojupa.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/talejowa.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/bemeveluxixo.pdfIn PDF document text
    • http://polkovnik.su/upload/file/81889967414.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/37234077353.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450e289c3c8---88178856782.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4419b1a2---wuxuxobikosulitur.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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10972 bytes
SHA-256: f9eb2e78e0cf2999a6c7347ab965dec8a7a32663d6104a1f5efabf7e9d893c03
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 18308 bytes
SHA-256: b6815984cef53f6fe2b71002a2e78192814b0adb0033c9cda9355ebfdf2b9fa7

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