Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f4bbe3f3602bee…

MALICIOUS

PDF

76.5 KB Created: 2021-09-13 10:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1062d24894e736f75d3db1b39799948e SHA-1: 28fb4ba9ed7c0ac573605eeff6a6660d204f0872 SHA-256: 70f4bbe3f3602beebefdd89850158db66e62c5e5dddd018edb253d7db3ef416c
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6660

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://mannerfeltdesignteam.se/ckfinder/userfiles/files/67362418310.pdf In PDF document text
    • http://shmgec.com/Uploadfiles/files/14753105834.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/92285292128.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/20481550852.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/lokanebofi.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/lonupexewamofobiromuk.pdfIn PDF document text
    • https://atavio.ru/files/file/xomukamol.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210904_B0BA403B4B9CE1ED.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/lifujugagugivek.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/42839326800.pdfIn PDF document text
    • https://angem.fr/userfiles/file/kuxakewodanopinazetuje.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/1836476121.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/parijurutorobikilo.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/74722728360.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2fda5f5abc8084dd169efd31dda73327/fagelevisazofagusar.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/bigiraredabumi.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/69798770681.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/57323372152.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/34711835481.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/36559859640.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/30418984308.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b702e12eff---kesuzuwisekog.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/11c9c030bae2f22c1fb0376628e16629/rarizemibinuduvemiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+enter+safe+mode+on+android+phonesPDF link annotation
    • 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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10792 bytes
SHA-256: f16cc74db7383885e2c0d8dad726d2b3de60654c6138925a1db3dfe2bd676a03
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 17840 bytes
SHA-256: 1cb274305e96764dfc624eac2940a0ab82103c7dc3856740b1bd6fda4e15103f
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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