Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f42c1678cc79da…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 09:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c70cc9c0e76204d8734f61f904a717f SHA-1: 2547d99a47fdc0b3eceae65ddd4e3cb34ef9ee99 SHA-256: d1f42c1678cc79da668994847ee71fcc3f9218eed3be1c2ab1f333ca2c85cc02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c23c0f7f---fasusokonesug.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160858b1e2ce2d---47109133167.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/daa12htpmskl6h6if56d9k12oh/kerewebubig.pdfIn PDF document text
    • http://short-story.ru/upload/file/puwafisifabit.pdfIn PDF document text
    • http://epicridesnepal.com/files/winapasikinope.pdfIn PDF document text
    • https://aedwea.com/upload/foto/xawipofedolemuf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609083627d215---galofanedobeboses.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861906cea88---wumuredosi.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/91038943745.pdfIn PDF document text
    • https://projetovm.com/uploads/files/51952043383.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/paxidov.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e419256de---61650641804.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/pexoxezupavafoxipokilolew.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a433f46f33---gubumulijanewadiso.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5d2bbee6---15814982279.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gifowakalarubivugevata.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/824ab8a77490b0171b9f38d37575aa23/texabawufutibufululuruwef.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/23048403480.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/51116105270.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/60727279948.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/kulakenizetaluferigewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=exercice+sur+le+pr%C3%A9sent+de+l%27imp%C3%A9ratif+6emePDF 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_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 11200 bytes
SHA-256: 5563bc3d37accafbaa5e3474db75c2d2fa9fe3e6695dbfa82c65bfe7c9165208
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 19468 bytes
SHA-256: 8637adb64465960176365d7af2221b26dcff123d619b2688753c29cbc245cfa8

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