Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ade1709c3563d8…

MALICIOUS

PDF

83.0 KB Created: 2021-08-01 02:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9db5ced64d3af6d3fb3d77af4609b3a SHA-1: 9987dc420802b092916f121ac75a82e59444256a SHA-256: d5ade1709c3563d80e8aba4f4cf303266a94198aaa2dbfe52611543929377558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm or redirection scheme designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b854e336---55662184736.pdf In PDF document text
    • http://griswoldremgmt.com/uploads/files/57074420227.pdfIn PDF document text
    • http://sns.hu/_user/file/rubunu.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/mozekovilibagakikopit.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/23795849559.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4eaa18dc2e8de049b24c2b978b9f552d/xoraza.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077329f8d376---seduwuzitefagabaxurikupu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2517bbd7e7---9770314985.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609def6169a83---76434105647.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108010418528147.pdfIn PDF document text
    • http://email-database.info/userfiles/file/17193301125.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/vadojowegir.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/totalafazixoroz.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/96093068691.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078334bb4560---62773280337.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210628102126.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/50187971397.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1cf563120---wewewarizuzajomukaxi.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/29603144220.pdfIn PDF document text
    • http://prosquash.by/data/jekoguvevumewuge.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4np3q5frl0ioa5smvqlj5ereu2/dixexovo.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/sosewudegivomabipowapin.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/37166780933.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec8b3b313---84497515640.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/rawulijigibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=reacciones+febriles+fundamento+pdfPDF link annotation
    • 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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 11064 bytes
SHA-256: 40792177c63b94425e204eb22267eed100622a1707b25540b26d551d5ea3beae
font_01_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 17012 bytes
SHA-256: 261e75a4f49cfecfbe531e8bdacee6f6df8483d3e626fed68e770973069ef360
font_02_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1