Malicious PDF — malware analysis report

Static analysis result for SHA-256 762596b0cb9097f8…

MALICIOUS

PDF

99.5 KB Created: 2021-10-14 02:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a1ac45e2b961066335e622b963c8b8b SHA-1: b252378d960850433a8c1a6270bf90213a2c81fd SHA-256: 762596b0cb9097f864e9f17c44fb98a20f4c55cabdf84f0b996294fa7520014e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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
  • 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://oldgradeducation.com/ckfinder/userfiles/files/musijowagokuragoradejo.pdf In PDF document text
    • https://samsunyapi.com/userfiles/files/daruxo.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905152233.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://miraclechuppahs.com/userfiles/file/rarazugu.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/xemivilupozugozekudopol.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/1191895815.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/pikam.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/nefelaj.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/lusujeparitaxu.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/nizefomoluzeji.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xonevefek.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/1394725608.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/fibamovopoxujatozukeba.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/19310817098.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b8af64b7ee---tevorupabutowaz.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/zizubakizugitoj.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ae4405f290e169158b26668aeaee440e/3475382828.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/dikefo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9823895076142890cbb395.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/52565923630.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/bilefepawutodabubunax.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/daxelefuzofuwadegebos.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a1714cc70---gexawirugerukosukuxaw.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/66577490935.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f94d4b524f---89843937767.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=infotech+english+for+computer+users+4th+edition+key+answers+pdfPDF 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_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 21480 bytes
SHA-256: 2a1528d3e0a9e0ced1765cb81b0cbb15982b204d6d0d5647362970e297973500
font_02_sfnt_off0001647c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647C 11488 bytes
SHA-256: 4ccca3cb828b12cec1008029b2b914b414622cd8b9388b8c5f242bf1c75760f5

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