Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f4612cb01ef529…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 04:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e03c7cfdf058546d1a54d03f75f3ef63 SHA-1: 51b194412f8f410ec46f17a4e53b4dbb4af03cbe SHA-256: 90f4612cb01ef529376bc2e2a609b10ac11df636e5bf51ddadc33565fe5305d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites and potentially disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.auto-ecole-acm.com/ckfinder/userfiles/files/xilegupafebijojiremomuj.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdac0ee46781aef5a1cb27e5b1615136/nalerewidetenulinor.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613612aa3a6de---dujejajozoxivux.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/7895129156.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/42072042482.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/totejapomusugakenen.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614059efc8b70---gafekamiki.pdfIn PDF document text
    • https://mfdesign.hu/files/file/24326425581.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/53223875465.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/tipibive.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/38685801740.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/20778143591.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/38508594995.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/42078404818.pdfIn PDF document text
    • http://inistor.com/ufiles/files/91869598331.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/46735001302.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/29126009245.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/fezozajizuvuvonud.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jruft6ecb9ln7l8fmeqq11vm1/55615543778.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/wusuguli.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/pegapudivewujelugu.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/sigegomonoxodonaxukazaba.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090514490126921.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630972257_6e20ec9d3a.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/wizunevesipakifimeregadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=123movies+power+rangers+2017PDF 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_off0000bb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 17288 bytes
SHA-256: 02cdfa09d37294380baaa76b423af1db4747da804e4a97ab39204d5c23dfb432
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 11020 bytes
SHA-256: 608fa821751ef8727da90315d30ebeb5db74f5e1501dbb02a5e843671d31fa9a

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