Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe4c2fb6bcbbf18…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 16:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12bab35d79b660ca5d54acde270914f5 SHA-1: 4028fcbc2142ea8e443376debd57f9ff7db8f419 SHA-256: efe4c2fb6bcbbf18e051a9fdde1e546227265ae674f3141f01a2282ce1530f91
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious link farm designed to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

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://queure.ru/uplcv?utm_term=pok%C3%A9mon+go+spoofing+android+2021 PDF link annotation
    • http://fermobkorea.com/userfiles/file/20210909042751.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613a806de4cec---42745503853.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/89659584480.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/xezipegebaliwobidefirog.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sofukawokubi.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/birijatu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/38b5ffb975410b33454e3029731c1eec/9282623416.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/89636930560.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/wokujibure.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/xetovefogawejaxalopot.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/37106963188.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/86cb90b99c1edf62f6bccdf92d0b0dfa/kuravetof.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/zusedofuwijobukidorivagu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/63891496855.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/welatodevifurufor.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/dosixirorupefozopul.pdfIn PDF document text
    • https://norservis.info/files/files/788116065.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613963593c7a2---26353131168.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/fusosepotesus.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd94a758d---68884663946.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/87548913923.pdfIn PDF document text
    • http://artio.pl/files/files/nededexul.pdfIn PDF document text
    • 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_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 18488 bytes
SHA-256: 763afa625fce59f63a785051aff966812bafbcb590b0ba80786093c9fce5a11f
font_01_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 11104 bytes
SHA-256: 1bde3a24ae1e692f4bea6f9562f0b39a705bffc9b6380506f0774445f189dda1

Open this report in the interactive analyzer, or submit your own file for analysis.