Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9e8aae05a59812…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 03:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8baddcc281f9d0bb370fc04e4593d13 SHA-1: 3bcd151282168c6aafd447a2238f1a89e1d329c4 SHA-256: 8e9e8aae05a5981252b284f2eee8a43e9240e0279fe40bab6c5ea1a7d79c95f5
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, indicating it likely contains malicious content. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.bnbtravels.com/ckfinder/userfiles/files/difiginizedipujofiwuza.pdf In PDF document text
    • http://murielbellhomes.com/userfiles/files/topumotukar.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/65527586879.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b666f06374---23567967161.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/c9peks05qs6co4e7et4vcnkup2/tififowudi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-4/20210704111052909985.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/babipofodudetijalode.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/99bf5eb46de774866dc3d412b7c67709/499794990.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052107572870554.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa55c5e7128---37935797840.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/91789580132.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/5987658910.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621284442.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/66755592181.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/26579427620.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b64cf3d2c5---bukoboseritavenezilo.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/luretep.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160868bf565353---muxubosepusup.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/31197675055.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/418c5e71516d5ea52c957fb4b55b3e13/sunukixemimedup.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/97908670094.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/mavek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pink+eye+in+only+one+eyePDF 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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 16692 bytes
SHA-256: dee9ba6fa255e202ac1b85a2b55e7a5a466fc5e1c7b5579e8f3d6d9a3748e763
font_02_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 9780 bytes
SHA-256: 2fec17c1cce45bbf628179ccc674839f47f2f987eef06f481641605dd204e992

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