Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a8019657a26350…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 02:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51fe32d1ff29c4c26675283e6095f177 SHA-1: a223494cbae8deb7230d82989b890c096200a656 SHA-256: 87a8019657a26350bd64753eb30bf686045fe948598498145a05d1e8ebb4479a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV and contains embedded JavaScript, indicating malicious intent. It also functions as a link farm, directing users to multiple compromised CMS upload locations, likely to host further malicious content or phishing pages. The presence of PDF_JS and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3298

Heuristics 6

  • 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.
  • 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.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/u68tn6o1ork4kck7ojj0kh48n1/jogidufipifelom.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc576b2af4---lurosuwezepitanamalejev.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gkffi2dotpnp20m6fs4h30db04/zukinuwivij.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609967bcdfa80---mabunipafuzonexow.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806504b4a43---mofawokofupenosepubenelo.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/9801584894.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/zulose.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67qv7j27jqao7lr8jb8bkt4nd0/liwalubetubafe.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/dakojulojifizeko.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/rufoleguberifo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/40b12091aab69c0f0d8b8a91da50de64/watifu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0igds1432cstpf9v0tanjudfed/4446687800.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/munejolizakuxopuw.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/xexivatazanolixixef.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/78410600088.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/safetoxuvaga.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a99okdv90veai8s27vt7g1hum3/69090474367.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608252dc413df---daluwenoferubenerusalex.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/poviwotabapu.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/xolokilufole.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/bamubipisinuwipetedipo.pdfIn PDF document text
    • http://iphysiology.ru/upload/12008454674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+cons+of+abortionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cdb117539---telolulirus.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 10488 bytes
SHA-256: 6980ef27beac11bb0aac77fa1f9b75787359efac3534b9a9ecf8d8e8ce4c3012
font_01_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16496 bytes
SHA-256: 4d5f87265cd3151046fdf12670fb5685b46b63888ce4026ab4056875c1f0ad71
font_02_sfnt_off0001477c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1