Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33452e734a5ca35…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 14:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26a81fdcf9fbc861545004dfba4ba175 SHA-1: 4d5f667d5e7f8214502ab00715c5588a4385bc0a SHA-256: e33452e734a5ca350235799ae31cfd4c968fb0e851d6c2f26deea478abbcfb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination through numerous redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://abaj.cz/UserFiles/File/nigalokerupil.pdf In PDF document text
    • https://lawyerupsmart.com/tempimg/file/fezutovinurifu.pdfIn PDF document text
    • http://classtool.info/upload/files/78468435795.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/666fcdd2b095dfc7f48253ce6dc56d65/4829986284.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/20030759872.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc34f6edd7---69478918555.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfad358f94---61880438108.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/391a5d3dcedb6da2fe3e56991ef2c1cb/45730307051.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/39850772703.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/madarufukujejupimafuzo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e49832d92d---rinelenimujujafibes.pdfIn PDF document text
    • https://unosms.us/userfiles/file/6728256179.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/20dd30e036d3439cedf2f235b443bdcd/zigorelawopipurexodidulus.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/13182181558.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/87108794563.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/setizazaxivadopujexobanu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160814b97627e3---67650241567.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/73945965814.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zofolijel.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/12855353998.pdfIn PDF document text
    • http://henca.com/files/details/file/16941537963.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/gadowipelu.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/54666626537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=multiplying+3+digit+numbers+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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 17352 bytes
SHA-256: 83c4b43ac9a75326be971e731e1108ad5a0006346dae0db0f193e2c2dd19cd40
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 11480 bytes
SHA-256: 9f171fef113522f07c05abfb3d3518f604a6f653ba403fc62fc92e80db580dd7
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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