Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a65f23ad63dae5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 07:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 444f1573a4d8e23c7127b31f135e3e75 SHA-1: 7001e63f167d26416b5a68a5909b14b8bf560f8c SHA-256: f9a65f23ad63dae501d0132d4ef9d69108d4fa4661c5b4f0ce28956bc5f710f6
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://coretry.ru/uplcv?utm_term=apk+forum+android PDF link annotation
    • http://drxzhang.com/userfiles/file/rupif.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/jefazit.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/50789386807.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nigikikubovamojimudet.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/21569229996.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///filagawobatur.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/29870382875.pdfIn PDF document text
    • http://ellev.fr/upload/files/gopepe.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/96463808552.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090322515820.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5401bd1a1---tepalukilovewe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81c54dc94---17871763992.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/86973044862.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/madikosin.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/51318815757.pdfIn PDF document text
    • https://heyratacademy.ir/file/jukabamejoletewuvefesevu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b520a8e---92778037665.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/nirenilebawenurap.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/11586319892.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/62117c38cb2b76dac7b3f809ae6e138f/23737467436.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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10388 bytes
SHA-256: b3a54b275a04241d1360c41c0b060debc8507dbf0083abc1dce579cb888aa797
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 18200 bytes
SHA-256: ef15cf334bdedd41de34046fbf5682f8c4c250dfd9ca8d615255a590eb9ef7d0

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