Malicious PDF — malware analysis report

Static analysis result for SHA-256 940e67ca823f9857…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 01:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 01c000c3a0545707a579388358bafe95 SHA-1: c926b1c5421a268e4cb47a37e61e2eb07276a9af SHA-256: 940e67ca823f9857d2197102786e934e8dfa414af3214fc958e2de3e97250b35
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions or redirect users. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to obscure the final destination or distribute the malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=galaxy+vs+iphone+2021 PDF link annotation
    • http://facyt.com.ar/ckfinder/userfiles/files/xejuzo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f20917b01---73645621990.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/neliloxikexazo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909051757.pdfIn PDF document text
    • http://elma1.ru/!upload/files/bosodajebinigirivat.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/59459219463.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/zemopipekinatoxuleb.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pezikoxopefi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/51540201461.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/foxujemabifox.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/94502036499.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/13143147151.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/fitolikasotafipirif.pdfIn PDF document text
    • https://5udua.com/contents/files/fegumudifi.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/24650841066.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/28075600136.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139319643894---gomik.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/76200134158.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/13219537466.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vumixesopufirugejedi.pdfIn PDF document text
    • http://shopabrang.com/images/files/munafu.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210902072249.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354d4a0227---gimizadigodoxivizokuw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12408338593.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/24839347930.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134733298417---bulozikewonetigofevob.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 17656 bytes
SHA-256: 65b4c72be4782e0ea69451fef16c1b674ef3e47afdf44cdae5ea48825f8f9145
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 10768 bytes
SHA-256: 5713a07f6c8b7fc8483942c73a6b01256bb32457612fe50fbf0b85c7eb0ce036