Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e48e2207b891a4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 11:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aefdbe42c57301ca1270dfaaad0aa240 SHA-1: 474f5c6f738439a72b1c3dea34d82f6452dda687 SHA-256: c0e48e2207b891a42dbcf2731436333b202fe2a82107149231a7ef034a4af491
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites and potentially disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=vice+city+mods+android PDF link annotation
    • https://pindimana.in/uploads/file/manijep.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/59747289646.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/lebaratafizazedexo.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/20780213761.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/nokexozixedatoxami.pdfIn PDF document text
    • https://alev.az/userfiles/file/14449652315.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/sudozogasataxop.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210914162511.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/13970859038.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hctfbb7basfil5enisstic7kat/5848791657.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/75442062174.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/2932753516.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/natitavuvos.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dec246b0d92b25d1f5acd4864842a0c0/14661754920.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/furikikev.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vfscmsfonpek709t8g72fitlqq/zalivomafitemefafilebiki.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/35607690803.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/roniwefedafubewurefox.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/77515484901.pdfIn PDF document text
    • http://ministerium.pt/files/wisefulasapegegero.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/28915967462.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/riwil.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kexanenotinadojamupaki.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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 17072 bytes
SHA-256: 124d42f962d7b472d17fa24fd0037103412dc56ab751a0a821b76b826f251499
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10568 bytes
SHA-256: dab2699f24e5664f60630ab64d2ce658ad5adfc27305b15fad7610b4610ffadd