Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd2ebb244a20870…

MALICIOUS

PDF

99.5 KB Created: 2021-08-19 11:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: fb65e0ddc4a702f7ff7fe70255fc21c0 SHA-1: b6256d723eb587a7dc855775a3e61b2796db94a2 SHA-256: bbd2ebb244a208701c9304104dba64a1769c181604646e6fee37b111794bcf23
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristics indicate it's part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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://archism.ru/uplcv?utm_term=how+to+hack+super+mechs+with+cheat+engine PDF link annotation
    • http://gekon.net/userfiles/file/mimenogoluregumo.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/65891863275.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/juxani.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/wuporuwodode.pdfIn PDF document text
    • http://abc-tel.ru/data/File/983590904.pdfIn PDF document text
    • http://mosjob.ru/images/file/36886041956.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lubazazubas.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b95577cb820---fafixudomeresivalarajagi.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/2k0cs9lf1tgnq14c55pk8rsc7a/vojolunar.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xufasagadanagudobufo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac6de468c---44497593483.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3fb4e4610f97c086168321914aed5995/nupejinuvadaw.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/padoka.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/90207499564.pdfIn PDF document text
    • http://nature-revive.org/files/file/vebotajopapafakofex.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/wasizenonabo.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/jibobogezujazolesikibajuv.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133017d470a---91373667874.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba0fbe45d7---nawapexutulelotovuduguved.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dql1iuhn3b9o9aedvv7j3h3c0r/74775745340.pdfIn PDF document text
    • http://unsersohn.ch/images/file/37063751880.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/24500626315.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/99033912363.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/vofovevamukulolo.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 26644 bytes
SHA-256: 57db1384f43b6be4f116300ac28728666c86d948060c0696ba230099731e3082
font_02_sfnt_off00013f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F26 16100 bytes
SHA-256: 75b586f21231a4504bd8518f65a798e04f1d3736e1680262625002f5996a6364
font_03_sfnt_off0001546e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546E 4028 bytes
SHA-256: 3b51801ee29de7cf569af64da229d9458f4acf926f0c17a6607b1d6ad2ef1c31
font_04_sfnt_off00016413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16413 11044 bytes
SHA-256: 480bce1844782a7a44c9a5e4ada46e16208064c6bf0aef00fc91b142d2b6a7d1