Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca0ffc6d5d58c44…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 18:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8042a7f639d6f9319b72217f078753d SHA-1: 7d484820839f9ddb8cf4ae28f27c59faabe21a00 SHA-256: eca0ffc6d5d58c44fd88f3c2e4c308a69ad6b5f98a33bcfe115f9c7068170210
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 https://irlanc.ru/uplcv?utm_term=a+golden+touch+story PDF link annotation
    • https://promaxsuspension.com/csmimage/file/kezetitavematul.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b5a2ff19---28222610486.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kekeposuw.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/24693693328.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6c73c463---33675357014.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/83335754144.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/73443865154.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/pusinifetipusobobolozobu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/sodimodugananun.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e94dbbd9047d378b82f0ae9737ee7719/sarusexopimarozisosakam.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/vokinupumegelubigusiduvup.pdfIn PDF document text
    • https://cargotavio.ru/files/file/kutuzakogev.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9b15360b45e20ff68c199eaaf3b3ba02/lefozaseteti.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/xosemuxeka.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/jufitivexotawazevuka.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/gozakem.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ee88d12b0fdf49e95654044bbfc155ff/tojinafetopiwowuni.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/faruxesawelalu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84f7f17b5b---keligopepe.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ba835e6a816423eaed6cf95f5cf71a20/73528590087.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/borowuk.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a875b2856---41544659793.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/77992443955.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ro7jp6162hntvvgqv6d6tn4tjk/57606610265.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ff375cecc9023ba3364fe7da651f1033/67607486809.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1m4et1t8h7ilcei1l058dep2hf/suxami.pdfIn PDF document text
    • 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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 10592 bytes
SHA-256: 4b9347480e3f528478906aec79ec4f12e4ec18bb1d7120f9a9382cee14240708
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 16868 bytes
SHA-256: 168634166e9dea1a845b0d6705289b7c0318f3ce14524d602531964752783f09
font_02_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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