Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a365a4c437464f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 20:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d78c6400f5d37cf3587c121f778b9c3 SHA-1: 7abd8fad3c78b097da0b1aa88bc20cd4e8fba9bb SHA-256: a1a365a4c437464f9fad63a209078c977a63095fd01f69eab0c4b9527a94bbeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also gave a very high score, indicating a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://gretajensen.com/ckfinder/userfiles/files/14977305445.pdf In PDF document text
    • http://client.diffuse.info/files/15022150279.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210904/files/20210904023607.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/95255348819.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/bodazimebi.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/60179721818.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb7a21f80---58499410408.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/44491692202.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/34674709142.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/58911245598.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2aa53b44ba18b6e44cce8f53dd0387fe/lotofezebej.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/736739239.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/eo1jqr19kirhcqai7ltgtk7u86/politidewamarufotoxetugaw.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/67573946917.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210901_221457.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/momewubozes.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/dapulatuxo.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lasogitizagolagebufiwigef.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/midewujukadagizilopi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1f89ff41---15758469162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+open+chat+headsPDF 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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 17328 bytes
SHA-256: bab6f10ac593e27df6fa5e37f310ebbd561ba5324fc9ace39489e6d5debfe597
font_01_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 10452 bytes
SHA-256: 192ab119d9f47f6ded0e49b17f80974c6258ab15d6ddccf14f07ba8256c6e5c9