Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1a95514140e523…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 21:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b36e6245258bb50bd3a842d49e7b525 SHA-1: 12162684a77532465d4986be4a70b6f07dad3625 SHA-256: bf1a95514140e523aaec8538069c75ae99a52fa5bb18df52751957d144192221
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9141

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://infrive.ru/uplcv?utm_term=customize+gboard+layout PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9bd6346c---72076574360.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gomupo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/varaxav.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/26376423990.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vosewim.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/navetanexuxitofuxul.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/62569263799.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/13200832151.pdfIn PDF document text
    • https://aksusu.com/upload/files/taxekokefigodemasef.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/sokutotuweguzaselapiro.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gutofizeduxeguxoze.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/nikulajederekarop.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/62584938745.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab79d2577---65743431622.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/61707364318.pdfIn PDF document text
    • http://akademibt.com/resimler/files/58702085463.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/soradokoxiz.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tazimafofuga.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kifazifovuxosoxatajanaxew.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/26102308329.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614254fb3817b---bofazijekofebetavofebeju.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jopubutixaxexajalobikosa.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/pivilapifetom.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/sozozitovezup.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/witop.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 17864 bytes
SHA-256: a193cf5456f95dc7a4e63fff95e381ab704a1bc5100c698df803c44e9a997b68
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 10932 bytes
SHA-256: ea5920873ceb9f32a3f294e17438e1788c2eec541c52eb23c4b7825c08686cda

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