Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b8fd4c3c6ceaef…

MALICIOUS

PDF

85.6 KB Created: 2021-07-29 18:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1b14045bac471d35a47d10360508b92b SHA-1: 181539eb6c3d29c15b6a86e0227372037847eb46 SHA-256: 04b8fd4c3c6ceaeff9ca44c600f8bec62209b98bafc9f4d61b9d6650a440d9b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mldom.xyz/web/img/podborky/files/63373807991.pdf In PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/katepukaxereligipen.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb92f643dcb---juxuwazizodiv.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67938127861.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/71601694595.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rfboeajhsjiomie0oi4hv3a6ub/57114148552.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/kupunuzulaxidor.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vhgc31o0a0nrkect5ipbvkd7q4/5101742461.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/vafowadunulupa.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7ab24b85c8648fbd1b131b67edc01dd0/91089802289.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93116bfbf---gawosubel.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/nutorizuviwilakun.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lesuwagutaguzasazezule.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/gemafibu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/eperetuwetanikobetulome.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bee189d98396449a2258b2fc9d84f318/27392332937.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/gikawekisizopipuwolesane.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/62227709061.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/vuden.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/7756859136.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/xorixubig.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a6aff7b4c2984788678e30c64898ead5/92787975790.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/27313208659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=simple+past+tense+and+present+perfect+tense+worksheet+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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 11140 bytes
SHA-256: 36867c711fc474e15295e77d26144176a874ba936d0c335dbf0beafa0f0a97f6
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16784 bytes
SHA-256: d4b5cbf803e74e91175778a19f823908d32ffb32d0cb54ca92edae914634e807
font_02_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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