Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c7301ab28ecd65…

MALICIOUS

PDF

65.1 KB Created: 2021-09-21 02:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 109f58cf20a13713a5896ad00af6c1c6 SHA-1: 3eff6caefd1ab572ae30b25431514b9cc92149be SHA-256: 82c7301ab28ecd6552cbdb498547a9166fb5981cbfa540a35872d2f7944c836b
154 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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 http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f3d8fcabf6035eddd189d771502a89f5/nuwosigagofimuwof.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/ripesegasedagusidaseru.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/zuvetadomik.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/nemedobojivegugejimi.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/katusuwigimefa.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/biwidukipotovinowek.pdfIn PDF document text
    • http://egitara.com/upfiles/files/25745184367.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_86B6BC30EE58C6BD.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/440fc08f6406e9948f5465faf2db1783/wepupujenawiz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613446b5b5dc8---128974869.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/ziwejavitu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/047a256ec0733e7e1ed02a5ef8129938/gosatasofekom.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/gejexikotefoliwup.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xolidagategazo.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/1091999537.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/fasewogopaxarol.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/61234414878.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/82930516274.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/zagojulakofofavadabogixe.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/35033828321.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/36573838582.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/39580563943.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/24807855011.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/30603011804.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kosapawuwegerofofizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=use+your+phone+as+second+monitorPDF link annotation
    • 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_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 17224 bytes
SHA-256: 74bcb59d660eb492799ac90b5d02960c291a3b5e7ec7cf395a2a7dd54175fed7

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