Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58ae24d31da2a5a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-01 23:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 649fa93ebc2c75635cd08fedfc0bd9dc SHA-1: 7d79b092cda994f275ee4cd4587199218630596e SHA-256: e58ae24d31da2a5a8febaea60512bbb2dfaf78b7012bc55fbd4ea66104a016b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://solemarservizi.it/userfiles/files/96026459620.pdf In PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/gudezazezutupepijake.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215171355294782.pdfIn PDF document text
    • http://thedreams.cz/files/7949254704.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/76013695472.pdfIn PDF document text
    • http://erpos.sk/data/files/45072534842.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vejuw.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/48436408110.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/63084477218.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/smtmt91h8cjtpae35qnfbqvsig/39714268741.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/fagexigamuliwaxemovafub.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/38784584434.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8b62bf51---84477361728.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6378ac9db4---suxiton.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cv73r8t4bb6ku83llu4lf9mjdm/85572545371.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/iqevfjf7jui5s3ub6foselj2st/zemazuvewijovutotikumobep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=98+usd+to+audPDF 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_off0000adf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF1 15576 bytes
SHA-256: ceaad8bb039cc62bb099a89f8e2e7378ff489852915478c1df9c408eaa8df01c
font_01_sfnt_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 10148 bytes
SHA-256: 56c0d7d0bdcc9adfa4806efb00b0dd089bf09c34f7fbcabe5f4f890ee8fe39c5
font_02_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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