Malicious PDF — malware analysis report

Static analysis result for SHA-256 554ba65ef7975406…

MALICIOUS

PDF

79.8 KB Created: 2021-10-29 00:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8dfe8523fb4a30d75afcaefcd229cb9c SHA-1: 8b0b7524f64e8cac99d8af95f39502c15325b59d SHA-256: 554ba65ef7975406910f0ea498481753616d4e2237d80ce5c1c94522621cf0c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://equinox-e.com/upload/UserFiles/file/buduwivemig.pdf In PDF document text
    • https://anukulagrotech.com/userfiles/file/befen.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/72324644184.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb755f84e---92896926910.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/73421652519.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/62677056511.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/ferurifeleropof.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/suremubobojekaw.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/92251601914.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1617a4d1aa5439---71601696826.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/volavisibo.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/67100734595.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/wakurawujo.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/89019786156.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/gimaresajev.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20211007_CFA4F704FC8FCE14.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb8b89200---13541434853.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/10664011041.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c53ee7f22---tapim.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/86916856063.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/xikipupi.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lodoxigejokupali.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/45851403990.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=hypoglycemia+and+fastingPDF 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 10968 bytes
SHA-256: 15c23f653e1d3f2f9ef27fcd4691767d0b7894eab1975a957bf2e9af98732d5b
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 17512 bytes
SHA-256: 92586ff987b744806a832f80fe0ff70191851be57a53dea2918aacba4779023a
font_02_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1