Malicious PDF — malware analysis report

Static analysis result for SHA-256 841d043a8b2c04f1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 01:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80617101dc98b7e7c7523fbde4c28afe SHA-1: 38d8af70fe61db5043a724760282051c7997becb SHA-256: 841d043a8b2c04f13188ba5e78bd2098d2fcff39e2bf70c6e1a7a7f47dc67150
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://zevkotodoseme.com/upload/ckfinder/files/72946547813.pdf In PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/21882106117.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zojinera.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/55144868588.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/th66huop1c155vldmqbc61bi10/wiwakavasiji.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/volufenodelitoni.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e4a83d92a---dipakuduluzibiz.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/86721491165.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/podasu.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/43230799728.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/23166011146.pdfIn PDF document text
    • http://rld-carbon.com/file/40758610284.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/pujexidaxotobun.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150bd5e72df4---5441065523.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/15216712457.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/3777641317.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/lupowojabifejesen.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/75519177861.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/97674998838.pdfIn PDF document text
    • http://innotack.com/userfiles/files/95799938778.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/mogasax.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/17157567510.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/rinedejabuxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=idioms+and+phrases+with+examples+and+meanings+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_off0000afea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 17132 bytes
SHA-256: 50090b69373e05837c77b92353074160e999cbe23fa24f422d5b894c4e0f99d6
font_01_sfnt_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 11084 bytes
SHA-256: 265f64630ebbd9096b7eeb1b508bfb87ce7279cdc667601a967924a6bed669fa

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