Malicious PDF — malware analysis report

Static analysis result for SHA-256 81818eb1126e2a6b…

MALICIOUS

PDF

116.0 KB Created: 2021-08-08 16:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30bab0420c37b4eb56268b163371f400 SHA-1: 08a46cbafb73e0fc464dcff14edb4e467b3cd068 SHA-256: 81818eb1126e2a6bb52b4a1f419b064d636d10b94585e028dbe533d5b1ce1145
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to direct users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://kasystemofkarate.com/clients/861259/File/fufatesomabodexozedafegu.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160845e8f1748e---66978378279.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/zukitobaxo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430231453185407.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/915aab584c9133b5d4536ecac1ecff55/wejipodigexamoleruxaset.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/40435310022.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/42v2t7574cole1bcgjvh0vqja3/76978832022.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jubem.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/feqorptvpbhcoo69dnptlc21sj/bamojub.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210803044827.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/41735212007.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/bulamoruju.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fafir.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/rubutagozigusib.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ad7e774f---tixipofuvizuvovibevawidok.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a73ab9e1c93e0779129a528946ec7a6c/rekexuzoxip.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/99285745273.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d5949a04---94400210555.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ab75c15ce083e0c26d1f9e4e340e2c73/6445767412.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kaluxilorukowivu.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/a38df49249f51d39579648d3481ceef8/wanokivomudabez.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c65a8c60c---xeludibed.pdfIn PDF document text
    • http://zae.me/datafiles/file/16814778005.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/28020171084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+reconocer+cd+y+ciPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000161f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A06 18544 bytes
SHA-256: 11eb1149060586aa587d754fb9ca5c5f099bdde5e56d757a97a107b97f1ac806
font_02_sfnt_off0001a8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8FF 10284 bytes
SHA-256: 53f975e7b9a0bfb9ba9f9659635b54bee505a9c30d32777d3cf872d82d0adb4f

Open this report in the interactive analyzer, or submit your own file for analysis.