Malicious PDF — malware analysis report

Static analysis result for SHA-256 5806a58b9677f464…

MALICIOUS

PDF

93.0 KB Created: 2021-07-02 11:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7db41baa53cfc1d3cf9252613eb4bfbf SHA-1: 8395e08412c37fd2726148dfc98bf0a1ef1b9928 SHA-256: 5806a58b9677f464785d07e7b7ece1ddc4b472f854e2fdad92f48ebb4deffff9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and other disposable domains. This structure is indicative of a phishing or malware distribution campaign, where users are lured to click on links that lead to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=some+assembly+required+buffy PDF link annotation
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076044608b9f---babezotudu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/89539671090.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/95799526283.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/31895483353.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/14271102295.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/diloxopolokevewaw.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/90226729533.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jkg8iltjtrvbnvoke7j3dgou8u/93673463593.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d88c8856ae---mapagoxolokinowisedusepe.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4f677d84---16084176935.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/49922156517.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/sia03p20ceoqhp57dktfkn37cc/28506944359.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pu8g7c55duahrjblm844l75n68/52150303890.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/39427066525.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/xawerinoxivogora.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/gedasavadexederaro.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kolls281fe7n6pdquvlu56h6r7/59957504666.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854543f4057---danegufuxiwaxutuwog.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/38407453954.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/xikiwajaxataropakij.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/91415268852.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 10888 bytes
SHA-256: e77f287230150cbabd42babf891b207dcea85ce7756a5b1b00c1f2492ccf9731
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 2896 bytes
SHA-256: 168c5affcc382d78381174f3eefd04f502ce1c793353d711d6aa1f70a60c0ea2
font_03_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 22308 bytes
SHA-256: f4655824446543c4b5b86d437f84c1b85f52a9c7e44c430f410c9793d5564a27

Open this report in the interactive analyzer, or submit your own file for analysis.