Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b79a66ac82fab73…

MALICIOUS

PDF

64.0 KB Created: 2021-06-13 06:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcf547e2ce76d8cf505e472131798994 SHA-1: a391c15a27c07ff1301992735276af4b131908a1 SHA-256: 2b79a66ac82fab732f0549f5e17732757c1ef9c76911eee08f1e7ffa4baed63c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting services. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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://archism.ru/uplcv?utm_term=apa+6th+edition+cover+page+template
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b051240e850---dinevezakuwagipiror.pdf
    • http://abwplazaview.com/uploads/files/20743691616.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757a1bb799d---jamudewisizariba.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/javukasazanadedinenax.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/jibetivufepuw.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/s52fgfi8upo50os7bkptvo9ns0/75056046751.pdf
    • https://abofahed.com/userfiles/file/foxudesababesepobudutul.pdf
    • http://ahxxzx.com/userfiles/202105/file/sasogorenipojumazunuvo.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d39937089828dfa9666970db15a25e97/32705703391.pdf
    • https://angkortaxiservice.com/userfiles/file/88841789079.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/muratizatusoladuram.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d15e71f3---lininusoxa.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1494fe379c8bb46345cf58882e6aaa9a/weselebaroxof.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2109c8c8cd1eacd360b469af5c289711/kovunufirapagejudevul.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402ced2aae---tasin.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4bubgnvnckbkh25p7gt394h815/11177159366.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e318.bin
667b933f0163611558e65a47e76876aa9744a73a4c1326dd7238046d3adc9cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 5512 bytes

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