Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f039508ef2a00e…

MALICIOUS

PDF

84.5 KB Created: 2021-07-23 04:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4de9aab21415bd6643ff1b3170e0989 SHA-1: 1fdc5952afd99c65a53329f9c56e9051715cc3cb SHA-256: 86f039508ef2a00e593b1e5524e17460469f18899b4ddd26fba93076e41a6493
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, numerous external links were found, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://0851gay.org/userfiles/202107file/2021070602483270554.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0aacb336565aab49819e1ee06b4e0293/vukekikusijemeripi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/66756716503.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/rimuvosufoxej.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/13188366519.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd658116b0---vakebivadodarogavufona.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/fosuvefimedanejolevom.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/37690182194.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5acab099---vakitubarusula.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/52021483986.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/69938994046.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210722022936187.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d151ede138---66382733590.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/24370355523.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/97337338639.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/xadisuzipenuzoka.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607275f1c8a72---pitofisiborolenevabobewiw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7e142f52---regitijowisulap.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40732212422.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c330c29f---58992693178.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/ruragatoza.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17a2df977---63147151684.pdfIn PDF document text
    • https://giustofiori.it/file/5004725441.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kmpfehus6a23an7m9hs50r5t57/nekumavamitifigad.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/limivaxuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lord+of+the+flies+ralph+quotes+with+page+numbersPDF 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_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 16804 bytes
SHA-256: 01c0de5ac2c74b07f345a721cdfd21e2dbdece2e2f5c2a974871eed807d06f9b
font_01_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1