Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb5b67e721759c4…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 17:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6980a5a909a46d48a2da4c0a774681b SHA-1: 019be9dde5de1e911625745e5970cc6591dd47a9 SHA-256: 8fb5b67e721759c41e2a666cbc2072cd72fe5f17bfc1e86dd5b5fb0543171554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that these links are likely used for SEO poisoning or point to compromised content, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=top+10+android+games+in+india PDF link annotation
    • https://bi-kiesabbau.de/cmsimple/images/file/71056346515.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/13828271658.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gateratotalusave.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/82338275557.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/11987939884.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/34567926546.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/47368753782.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3767309326135d8242dc5c.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/zanuvudamagiderigulaga.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/10531108864.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/770e09660b7ef7a2c3b5e0dc0d4e3f81/begarabagosimivuxijul.pdfIn PDF document text
    • http://cmtsport.com/pliki/wuxirewumividenujateto.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/021009069802.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/laruruxufugomiribiru.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/xuwotujedas.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/miziloj.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/gawaritizewekawazuvira.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161398f2341436---telopolodatopexoduwumov.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/jidebumaxakulujozaru.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xeseji.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gupetiwufegem.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c9oscqa3b3i90kfiuc1108o9ko/61530443780.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/najom.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17b5087c7---83730908330.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/54016832670.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_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 17024 bytes
SHA-256: a2a9da7d4f5a67b2fc7324b0fb770908da304f5fd56258e76e006c288219cf37
font_02_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 10728 bytes
SHA-256: 81f0dc8334f280d22fbe10bf7146c3db7fefa52c818077a0b3fd5c226c450de6

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