Malicious PDF — malware analysis report

Static analysis result for SHA-256 90267ab0ed77b125…

MALICIOUS

PDF

361.9 KB Created: 2021-07-17 03:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ce31cccd6a60c99518e547d4da1375e SHA-1: 3b2df87c4bd8f2db14c4256b27b331b22cdf4311 SHA-256: 90267ab0ed77b12526eae9654407238cd2b1ce082098709289bcb33ae587ddde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute malicious content. The presence of these links indicates a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

Heuristics 5

  • 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.
  • 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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb23122ea6---tevexozi.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s2qmvnosirbh1r046neth72ou6/dotipemojurunikatakasu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/36088191915.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/8406362271.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/67359658119.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf96048769---8715027122.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/82cfdb0995fd4576d6b71222adef91e5/16728636009.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/618fd5cae19c025fe206980d8edefc9b/zopolezedewulaw.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/wuwotasotuwufalelimakuwa.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/gerudafilalijomusipexuzu.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/77365009906.pdfIn PDF document text
    • https://medtek.vn/storage/file/vunuzilumawilarid.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/45219852819.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609128b250798---rasidag.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d006cfa712b---jamevoxiwikozoxuwirat.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/fofapewuwiga.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/12885479820.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6005e5bb8---nafetebojufotevugokebu.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/78450768883.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72dc0b73a6---35390678876.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/71908502039.pdfIn PDF document text
    • http://chinalabware.ru/d/files/89789115567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+stop+worrying+about+cheatingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00051efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0005370c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5370C 18592 bytes
SHA-256: cbe522dda3cfae8f88ed9cb9b111111aa5cccaac1ef6175bee529e07c8a5e890
font_02_sfnt_off00056812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56812 11036 bytes
SHA-256: 4236d1ae356876eaca5bfc593fe192b78269ab8031e9adde801b3bfdfc9b1115
font_03_sfnt_off00058194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58194 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27