Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b12e3c5d11e8904…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 10:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5df2adfcb23c4bec758df4844408e63d SHA-1: e5a9fa820ce4bed323214415d1971a067f062458 SHA-256: 8b12e3c5d11e8904bc6883b61b01842669403beeceb89e0a77fb64dd13227225
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports its malicious nature. The document body is heavily obfuscated and unreadable, but the heuristic findings clearly point to malicious intent via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf78482ede---nowerofalixuvumewavafam.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f846f2b3fe8c294cda9be4943d3373a0/wofawedesebogakozutawisag.pdfIn PDF document text
    • http://simonide.org/userfiles/file/61180083657.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021080613581968.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/81700b60a670ba75f2378fc4f8a30d29/22963799888.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1ce321bbac3415060c060513c02242ff/xivuzozifuzaxugugij.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/47897563351.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/nabemelomakep.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2d47db8b1---71896367726.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/27158871190.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/vojavuziwatoxipima.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/pazuzusikov.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/28149933406.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uqdsd9ds124dhuu6a2qlcrgsht/zubomazisinenojas.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a8264a487---7578167708.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/83830171282.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de91257d25---fexobitiluxetomeg.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d78cf87005f---sejaf.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lefuvaben.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/46446318087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=klima+und+vegetationszonen+der+erde+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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 11060 bytes
SHA-256: 75210d9f32dd8da0d5ce7e8f98c4e7c493ed6db906b0bdcf725d4b84be2a386d
font_02_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 19820 bytes
SHA-256: a0862d68b0483dfcdaab1863f8fa84e88a0901b406ace6b3b4af5a67ca6d27b0

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