Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b39fbac158090ea…

MALICIOUS

PDF

90.8 KB Created: 2021-09-15 10:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73fc38bbb3d49ec33e86b2048ef2ac4d SHA-1: 0a03184545a15a2c698379de5b2333ac2648b69b SHA-256: 8b39fbac158090eac6bf4191dedc28f4aecb4602f37fb47c9c260a4c1c40fbb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for phishing or malware distribution. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chcial.ru/uplcv?utm_term=flutter+dart+plugin+not+installed PDF link annotation
    • http://phongthuyphatloc.com/luutru/files/medikesib.pdfIn PDF document text
    • https://vitanov.rs/files/wokakivagupodebomaze.pdfIn PDF document text
    • https://svltv.in/userfiles/files/39398405490.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/32124017177.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614178023333f---pitesurejinali.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/tefekavikumovojunudeguvuf.pdfIn PDF document text
    • http://epicridesnepal.com/files/xanizafozutexapenakefodu.pdfIn PDF document text
    • http://halmar.info/userfiles/file/dotejudejo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b921f5a6bb5e4485d0ce66ace686e864/moriruvetodesewepu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613061d597cbc---gobev.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe33756a5---84779657841.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/75691381652.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/92009741348.pdfIn PDF document text
    • https://semut73.com/contents/files/tazomo.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/20284418463.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f21c17fe---tidori.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/59188404950.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141828043b02---25826656414.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/16177982352.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/fupusosebej.pdfIn PDF document text
    • http://manu-transport.com/documents/file/xaboxafapox.pdfIn PDF document text
    • https://rotitelor.com/contents/files/71696296462.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161412a8f74a53---59183677462.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 18972 bytes
SHA-256: ccb6f84422010a4df3e6146a243f5d178cdaabe80a43292a17bf529063c172b1
font_01_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 10644 bytes
SHA-256: 69ae9907e9dc20fba6c9a3fbe2e1ce5f6443722640b8a0ed396e7a8e2d407b84
font_02_sfnt_off000144e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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