Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b4359195269204…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 18:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a5de061644ae5f1b5e6b09911aca732 SHA-1: 7c2f3e78796fcac1e1e329a805f2947cbb043b15 SHA-256: e7b435919526920497375e7d15de3a40acc30956799e271152e820e224ae9a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bb3e0f1eef2fb1f2c64dd9ed448bc424/fixapurin.pdf In PDF document text
    • http://babyshelter.net/assets/upload/files/88912779411.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/96346242838.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/75776536854.pdfIn PDF document text
    • http://plise.org/userfiles/file/sozeridijukuwugoneraro.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xesajofapujujumekex.pdfIn PDF document text
    • https://tadimtursu.com/image/files/77575649972.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/249015838.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/lulawidoxuf.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/pugujopek.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/zixatagijopewusinaresasa.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/vazajoxorofufituruwab.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/78623498837.pdfIn PDF document text
    • https://salwangurugram.com/files/19622192779.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bobenuzadobedoxubuga.pdfIn PDF document text
    • http://snsi.jp/image/news_file/6902812548.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/40659034619ab25ca4eceb9b970ba74b/nunot.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/43378949208.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/30360e2e837a5ebc80b9a643bda3cd41/41196630077.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/66234126651.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/70644221556.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zipuzapojibavik.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/napefizadezepoxaxubomuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=eternal+legacy+apk+data+offlinePDF 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_off0000c034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC034 10816 bytes
SHA-256: 1e5ccc9641fd02d0d358a81b6b9833844f0ede67aa49ce9d3f9beb40b50b7ff9
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 17356 bytes
SHA-256: 125acf5d023d021ef2e4958f6bb78b457b249ca8b1ae74af978b6d996026c5f7
font_02_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1