Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eff83a161e7c7a…

MALICIOUS

PDF

69.1 KB Created: 2021-08-05 02:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 650456610dbca04fbd497d3ff9c99711 SHA-1: e8b812c01f2cee3ddbb597b818d03305c6e26b79 SHA-256: 90eff83a161e7c7a077e7505724ee165abc7078b334378039253ea665815250d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a395aca2fcf8ed06d66b5d18aa8257c1/lojetipekimemiz.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ab85338ebe3f201c6c21f84e6b21dc26/musuvibenegasebonuki.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b32d7e04130---37158104892.pdfIn PDF document text
    • http://mp-journal.com/media/file/81063129196.pdfIn PDF document text
    • http://ttc-investco.com/img/files/sumubijifugu.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/faxetogig.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/54088572987.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sulis84bosnksdchhep9pfj78s/dunovefe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b04b5758---91469048964.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d17b1e1e6---47560821729.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/vaweveku.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/78914618324.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/nufezolomoxux.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/gosalas.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/knkkjqcqcn10id1n76b4huobh5/zutudugafigadutoxone.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7384283265---mexukemojotaxuzuj.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/fodaribujofegawujagupixo.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/miwef.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4af160ad8f646b7d289cc69e02f27192/zobugozogasevamukib.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/voxan.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/41859828055.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f2a6esbvl0i0hnkmqo78on52s0/jifixodivok.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/gulovexokumasenedufujijov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=facemoji+keyboard+for+xiaomi+is+safePDF 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_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 10944 bytes
SHA-256: a1bc1135af01f769b4664ab2be21e8ac9f80098f480f83e10c870c7e95ec9fa8
font_01_sfnt_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 18380 bytes
SHA-256: f96e6ee19db72ba305c72bdbf1202325354fa23cadb160131e100f3d5466f51d