Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c21612373f137df…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 10:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f517c88b6e6d6940c956fe5ae434e820 SHA-1: bf8ae79f6a682e388ca2ff816e5a3c970b9153b2 SHA-256: 5c21612373f137dfc5b3adb93d34e71bf001bf4efc640323083eec9dc4b02461
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristics suggest the PDF is a link farm on disposable hosting, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4570

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 https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161348ffa8dc43---1698475596.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b639fd0309---pafakon.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7ff0abe3---15431495317.pdf
    • http://strelnicebudejovice.cz/userfiles/file/32136482828.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/fejeboka.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/xuvekasolenimumupe.pdf
    • https://trungtammatnamviet.vn/upload/files/33126604154.pdf
    • http://mondoacquapiscine.com/userfiles/files/tejaw.pdf
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/35531128809.pdf
    • http://chip-chup.hu/upload/file/tezapumewuliduv.pdf
    • http://gzmingjun.com/uploadfile/files/20210910_052457.pdf
    • http://kxnjl.com/userfiles/files/44246892892.pdf
    • https://marlschuz.com/userfiles/files/83769592925.pdf
    • http://www.vinoplaza.nl/img/upload/files/losijixijoto.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/muvamijomir.pdf
    • https://kermoulin.com/userfiles/file/kodilage.pdf
    • https://grootformaatspandoeken.nl/userfiles/file/tefuxoz.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614851434bd22---5480233441.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb79397645---kedufoniselanevoni.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/23545882597.pdf
    • http://gadkowski.pl/repository/filemanager/file/salunabodadosumaxilabep.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/71d77150bccd2df888d064b8d9b2e00d/71814789480.pdf
    • https://m3nan973ru5-pa571.com/contents/files/75087004853.pdf
    • https://hophamthaibinh.com/upload/files/taxalefonisifalipe.pdf
    • http://idealthailand.com/file_media/file_image/file/fomotasanuzuxijidotumeboz.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/6600400895.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fallout+shelter+online+cheats
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df95.bin
64aaa32c805f339b93bb52c81d38fa6ad0bc5d8107337f5b563020d9e7348b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 18952 bytes
font_01_sfnt_off000110d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 16792 bytes
font_02_sfnt_off000128e8.bin
aa1bcf4b1c3a8086fa745e6be3d7306f2a922525b2193f0130f23cc2e595815a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 10404 bytes

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