Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4665dc5995de98…

MALICIOUS

PDF

69.8 KB Created: 2021-09-23 16:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ca378ac3c6e43789c0b53f048bea5f7 SHA-1: 90a5db6c4a5b5177426d70456ab74bda7f74a4ac SHA-256: 0a4665dc5995de98121016fb32b34268fc8f37b16c9b767baf93fcb1b740f916
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress uploads and disposable hosting sites. The presence of external URIs and link farm heuristics suggests the file is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=mtk+engineering+mode+audio+default+settings PDF link annotation
    • http://dochoiotovn.com/uploads/userfiles/file/tekiti.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144662bad750---16260351534.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/90760855815.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/735a129f106274bc36bcfe2722d9e498/jetuximotijev.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/32ca611e844f1b18e3f67f6bfdb61d49/penutetokexofesifufor.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86c57de3e---4039348.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/40635964227.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613578357ee67---jixivenurenapef.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1631379380577.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9158c94bf---23547469241.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5aee2786---tuvupatokad.pdfIn PDF document text
    • https://kawanmto.info/contents/files/17744366552.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/josuvazikupes.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/witozefazuwubabo.pdfIn PDF document text
    • http://ijfbn.com/editor_up/8314905291.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/begupovebamawisi.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/60417003672.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/jevozoluzep.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/febesodubikeneriz.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6064dd7c292283e8ec511bdaeef6ae11/28920057555.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bunuwedivigekifofapoxupo.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/95644480873.pdfIn PDF document text
    • https://webmenuplus.com/images/file/funovetuta.pdfIn PDF document text
    • https://agrando.cz/files/file/lotefaxol.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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10884 bytes
SHA-256: 5eb481c43ade83984877d80de59e7908cfb1359a26812a4f54c3712e50db5777