Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd69526138f97bf7…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 14:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcdccd5dd7c5a2aaa6625c08f6b1fa15 SHA-1: 6dd0c1f405f321afbd452c4e18753944f652fb28 SHA-256: fd69526138f97bf7cd3d8e62c20b1b34533664ddb8a6d18c137cc0cdadf9aa76
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised websites or disposable domains, suggesting it functions as a link farm to lure users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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=tekken+3+mod+apk+android+1+download PDF link annotation
    • https://lanegarrett.net/userfiles/file/57649182980.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/39034944761.pdfIn PDF document text
    • https://demoepaper.104portal.com/upload/serback/files/20210925103818.pdfIn PDF document text
    • https://buka.ru/sadm_files/90337160474.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7a3c144d---derera.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/nidirefuw.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/sojefutubunosupena.pdfIn PDF document text
    • https://nesselaarbestratingen.nl/plaatjes/file/55848559963.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/727d1d60167a6d25172dc82fc6926bc6/kebibit.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecbd019938---82824803749.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614e63da9f68c---tataliwesalatujujofozexak.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16149a6df9ab27---bezojutakidofakol.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147dcc005687---90270270266.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kp30cdo53pu9q49d2nte79efnb/29201868285.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/49332727430.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/30113711889.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/kiturabaribalidifufero.pdfIn PDF document text
    • http://lex.tj/img/file/58900636826.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/5096200644.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/zoxumatawatebopabax.pdfIn PDF document text
    • http://bulmarconsult.com/files/28743536177.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_off0000ad48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD48 14520 bytes
SHA-256: 746811b052fc8457c207acc954f3c331c112ea6548e8a458319a64116e1956e9
font_01_sfnt_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 10652 bytes
SHA-256: f1d2be3b5c2620dfefc159cfd1850582827fd6e8cb9210dbe261506669f65167

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