Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b5db257a907e4f…

MALICIOUS

PDF

103.4 KB Created: 2021-07-14 09:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 661bfb6f854863b396cdd1137b74f753 SHA-1: fcc58479d4edc6eb83d03b7faa715ef9b9bb58b4 SHA-256: b4b5db257a907e4f8c2bef0417aac6bb4551c3ac37c4632b0b7211a17f6a9abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains hosting PDF files, suggesting an attempt to distribute further malicious content or engage in SEO manipulation. The presence of multiple compromised CMS upload links reinforces the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://reklama-v-sochi.com/ckfinder/userfiles/files/4801123017.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cb7038c8---gegujafomudegomega.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160828c77650df---nifuvifitosasoxepi.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/ruzosorezus.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210627_A08A95778636192E.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zinepez.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/75721989657.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c862eaaca5d---vadavofur.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/wamon.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1ed8d1aa---ridasun.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe1a8f2db---18432846942.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/55484047977.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wesugofiputababuwadeviveb.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zolot.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c67db3cc81560aea77a380ad89132e0b/turemevuverelu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd18c7d70f---kefewalisid.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/50034778666.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/dofewoxuluxoxor.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pgobfrt0kaqnhvhmbj93al6gav/xavabefivibimar.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/o5c85h4051shdmaqikpsrfqdn1/risifakogumevumop.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/78347500302.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beffe822b6d---65283858843.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ca187ae4---xawilezabos.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/rutaxexoxaloti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=side+of+square+inscribed+in+a+circlePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 18908 bytes
SHA-256: 55b994fb823cb88cd070d0c37d67ea0e704c68d3b99b9333c86ccac72190cc67
font_02_sfnt_off00016157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16157 10832 bytes
SHA-256: 641db4918c4d74a3f7f6d889acc848cc6f8f5cbe92a80e14722572319b5a88fb
font_03_sfnt_off00017a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2B 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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