Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24dd016ef1e5975…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 21:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c271315ca4a92a95938b8f84714de353 SHA-1: cad6f28b0ac605c7c953f92f36bc1e9a2da6c193 SHA-256: e24dd016ef1e59757eeb6f0d4010bc17b21c04d06600005d154e95eebbcd6324
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF link farm heuristics suggests an attempt to distribute malicious content or phish users by directing them to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://needychild.org/ckfinder/userfiles/files/tukevixinegodalezegupajo.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161309db7ba645---53275452116.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/38317139108.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/28457079596.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613501ea85853---77325768089.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/63266064324.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/fugobelitodize.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/xikoloroniso.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f75cc3ba2---kuxafemivoborexuneraj.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/50438922472.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/lutokaropitesedivapuwebo.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/85797328365.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/mimenogolipeli.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210906_205353.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-5/20210905030417681053.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/pavomipipinaje.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/94101528928.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/49717904576.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/juvusoki.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/4220099707.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/mizixopiger.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/23729354154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+free+apk+versionPDF 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_off0000bfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB5 10580 bytes
SHA-256: 064b50c20c9173e3094e6f30a8d9e097b1349cbf3c26fa69e718f1e4de2cde99
font_01_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16364 bytes
SHA-256: 03627ffd3a99b437d93a38522e5b4b73199da22723c2831f863db5ce04e3bd75
font_02_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1