Malicious PDF — malware analysis report

Static analysis result for SHA-256 4228a188c9e59bb3…

MALICIOUS

PDF

60.9 KB Created: 2021-09-12 12:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2de39ef1fb30755f6d1b75d2f21bb37e SHA-1: 803f25c7da0b659f0526eebc495d9c386707bde5 SHA-256: 4228a188c9e59bb31af580b8d62b9f543ba256d84dccfdc3f8910ddaf75bbc64
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external PDFs hosted on potentially compromised or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7785

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://synerhu.ru/uplcv?utm_term=android+klient+poczty+z+regu%C5%82ami PDF link annotation
    • https://atavio.ru/files/file/bovinepaxezeputaxu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/27999908810.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/68373940247.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35230fb96---niwuzenejutakusitozozibub.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_A2A92DB4131C4736.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210909_140310.pdfPDF link annotation
    • http://vertracapital.com/uploads/files/vamowexajatexite.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020051317396.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/totasefawedeje.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/74449550617.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/mofugizis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27c0339c5---zubezinavuxopo.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/43162667293.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/kekobekebolobaze.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tasidabikapoxanewuxi.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/lekotor.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/sujezumebugibotilufaxob.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/91419411442.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e35c5929f---4040872384.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_070110.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/51362072260.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/68957325829.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/38567419524.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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