Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86493099eee71e8…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 07:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2b0f1f6cc08b4bf4140fabbc2e8f07b SHA-1: 3420293c1354b7e92b708feb55db97061cb3f336 SHA-256: c86493099eee71e8d09fa59b7a16e37a1e360190bc65fd4f6394474156ff1183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a deliberate attempt to host malicious content on potentially compromised infrastructure. No scripts were extracted, but the overall structure and URL targets strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=grown+ups+2+123movies PDF link annotation
    • http://balone.net/_upload/file///13001260032.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/valekufalitoxewuguvuzopal.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/69987159353.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/24908110452.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/gobozewebomesenimuf.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51238132587.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/25482300734.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5e63c87a---witidajepofiwebopa.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winujoj.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/90213514516.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/16800791216.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/10992053547.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/puvofivewivilefopilenu.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/19297604657.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/35472773887.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ad6d6e66---87546767447.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/kekozabibutowafikogenaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14234d14---xusowowesuvogoxipa.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/94024041506.pdfIn PDF document text
    • http://sinostandards.net/upload/files/dasatisezalotel.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/zowerolozujekize.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/lolemob.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/96426702451.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/bikerovekonifegodalopozax.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_off0000bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 10740 bytes
SHA-256: 341bd39191b0d1b28573180561930cd6a3d2ae58aabf4817837b6ac08588e5de
font_02_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 16720 bytes
SHA-256: 1102f86ed95aa9d9412f15d761025419ad4d3619a507306272256f81eadb2013

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