Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c8d63867c64b3d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 12:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39bea329506d90c173c7c36054af98d1 SHA-1: f1b98713b197acfdec8fbd4e57d263fe9f482bc1 SHA-256: 36c8d63867c64b3dd06d30231e301e3f6017097aad14a388cded2380d8d0f271
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://geometracosentino.com/userfiles/files/legodonitirejajit.pdf In PDF document text
    • http://origo.ws/userfiles/file/35497488102.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/98353998861.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613485481b553---dajojik.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/7703953370.pdfIn PDF document text
    • http://bubb.cn/up_file/file/33148111528.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/9208839567.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/pefosalazogopik.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/80462955693.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f401bf73---jadomibonubekidigomala.pdfIn PDF document text
    • https://binhvi.com/upload/files/28647188782.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/25434763710.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/tiwidaf.pdfIn PDF document text
    • https://angem.fr/userfiles/file/seritatige.pdfIn PDF document text
    • http://donghotam.com/luutru/files/2313261221.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/dowaxavenepiriro.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3eb42ced5744740f747dfc15dc4a849/lomunow.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/nojobeniva.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3a564ebc---jebukadelegebiponapobun.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxeturudukirejexipudotot.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kufedelagisa.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/bisuxom.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/39986360098.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zizuk.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/tojuzuzejuwedejexawesaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dhoni+cricket+appPDF 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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 17320 bytes
SHA-256: 03ba67e6fcb443b11922bf36ef92aec2960f45059176649ec0644be23d5ae7d3
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 10352 bytes
SHA-256: 913cefd2274c51bfbb34b5f641f7e516bc9e26cc4c50f6433b20816ce052b724
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1