Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b13472b761f125…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 21:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3fde6c19e9eca870bfc5e8f26f25fcd SHA-1: 179108635dee426d94c07aa86f7e008ef46b8c15 SHA-256: 90b13472b761f1254604ab16997bb457deb1de52ab7fe5df5b630ad051c4f93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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=shivashtakam+stotram+pdf PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s7ord0pk95ehie72bphjhjv2cv/poxipejerumisijuton.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/61232187583.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/71914097730.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/7680090741.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/6797064413.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/81049308977.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/17333484367.pdfIn PDF document text
    • http://kisito.com/userfiles/file/48550015793.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/60981726019.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a6bcc4eff36d6e51a6472047400b240d/xipagexoviwisuba.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4827d4f1a29d4fcedc0c470e6ab7d639/55580418929.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/82584583388.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6c0d99ce3a787bfa3282a475daad94b/42822692361.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/803a570af279714730567b5433ae4335/tadituxitudetuvozenelavak.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2bfb92de---kitozapoziwakaxi.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/25086256375.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094acb9a1f21---zufoxow.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/pimidugovawaxileso.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608756ccae59d---birarezapuguzu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/08c554fefc4d189d4646972b5fbf7db2/19515818329.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/65122240052.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8f65f7d705d0c7839b90daa3f8d79c28/87373885638.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/61c8df01d524677a76db89d9f3ef9b3d/77304956386.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/51722756523.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/105f7bb53e2b6daba3f4a453a67cd38a/59423967909.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_off0000bb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 19724 bytes
SHA-256: cba106dbd3f9096e4027c625aebbf0c3e97b062c6d1fc8075b0a23c8d414233f
font_02_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 10716 bytes
SHA-256: 554e13cc354773f854b48d609c5878923f507158f54deba5f615fbc7eee71057

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