Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb24eea5cee7ae68…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 20:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22399d68e98f6402c629109c576e2deb SHA-1: 92bf5d3648e9e9a9d6f8d59490500f78761bd3d7 SHA-256: bb24eea5cee7ae68c371ec28affeabfa7fe89ac2b7a57ef16226a1d2be44a1a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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
  • 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://queure.ru/uplcv?utm_term=tamilrockers+latest+url+2020 PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecca25b81---kugiminonedakinuzin.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/gerenomi.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091902472373499.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/14541263346.pdfIn PDF document text
    • https://gameclub.by/uploads/files/korisobodomesebirobul.pdfIn PDF document text
    • http://snsi.jp/image/news_file/nejiz.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lidozerasapibos.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/58741911441.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/kitopinoriwubizomawivazoj.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/wiwefatanobiwebiserakadij.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/84490706341.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/52316866963.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/52022462582.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/lojidawewo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/wuzet.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/28582119791.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/2688279057.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/96151035873.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/076891d6fbfadd8d4ccf5338db9556da/74759757934.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/19918719385.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/wugakasipibafiwujun.pdfIn PDF document text
    • https://rajakedua.com/contents/files/62775070198.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e7744652---46031846114.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/96391644164.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/zufomapetalotepiwiwugi.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_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 10684 bytes
SHA-256: 9b46027d5301c8594dee572a64464ef3d9f4116699b56b97cfb460f11e72f1a4
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 17576 bytes
SHA-256: e97a06564dd4fa5b73dca6aad82e7532c85a2acbe97514fec23f11a2a17c000e
font_02_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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