Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8f22ac2d050c19…

MALICIOUS

PDF

74.8 KB Created: 2021-07-17 19:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d8d75f85b26f268fe511e6d2e9a97a2c SHA-1: 262973127e80f0e047c4e5fbc3b28dc9f2ce1234 SHA-256: 1c8f22ac2d050c19c321c39c6a77d47e8beffec246b2ddf3037496f64be23dfd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary function appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://hosvagyok.hu/userfiles/file/91237185377.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c927439221d---46202631902.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/50730930326.pdfIn PDF document text
    • https://starbox.fr/img/files/sibanolibopobuzepaxewido.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/89945998336.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/20557690512.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/ledotavigunipuxajabira.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cc27b3a0f---kupilowexenelodaje.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/90885681114.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ghb7a88g6l6a2arkgckvoacdq1/55606988107.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/75878574177.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/24s1c09li2ob8dav5hfiho7r94/62638554326.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/14893841785.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c722767c9d---tulivusukajididipojixoki.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b3ba71490665226ab6e063927979c3bd/4298419309.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9385f47c6770cef88d1512e8c97b0d27/kevirefepavabelu.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/somufabajapumet.pdfIn PDF document text
    • http://aa-nusd.jp/40887789630.pdfIn PDF document text
    • http://siembra.me/uploads/files/2944249334.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5348f0e067843c34d16b8ac9c0ea3b3/nuzowix.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/vubix.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/28390255782.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae977918e---rexawamiziwubutuviru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=reasoning+questions+%26+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10428 bytes
SHA-256: ac25d30bb98408dc594ed4fa9b98b122fd00ae2f0cc191dc5e26481b546cfc34

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