Malicious PDF — malware analysis report

Static analysis result for SHA-256 3539be7de1cda946…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 20:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 853d529bb00ed2d4b0103f730fa03026 SHA-1: b3a8bfa098ea9f807fe0953a7ec9e034e45aee57 SHA-256: 3539be7de1cda94664004809e80551fd3c31e3a9501c136d77d56504fb1c32e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. No scripts were extracted, but the presence of numerous external links suggests the primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=install_failed_version_downgrade+react+native PDF link annotation
    • http://imreelectric.sk/uploads/file/78584357018.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffe9bfe76---4077002237.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wurulufilekiselezurezaw.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/97460278590.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dmalknkf4vifauvvmqsuje3jmi/66828091362.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/texaxaxu.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/gamuv.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090619847_762918575.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/kuraparujemuvokarivori.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/bozogupapeduxojodopoja.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/sowugekobemufos.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/4315547644.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/nikujopag.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/30763502858.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/bezijogufogurax.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8940dee2437a2a593005bdfb9f9ceb1a/nabebutiporepizilemiduxin.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/89766634035.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8827b0ba---67002534596.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/mupovawoj.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6f696b9d27bcfb09cc2f4d41f1566138/90830537288.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/dizujupif.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/99834276381.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/wominobunokazexifalefome.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/54691028251.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/buvarazilexigosox.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/miwuvefasive.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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 20064 bytes
SHA-256: ef273679785003f574e7b108fd28d2a99471e020ba988acedf4c6c3912e1f781
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 10784 bytes
SHA-256: 747a7ab56d558a6edbf24ce84d40d6c9e5d97bb2d639ee85b20ae9b2152e7125

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