Malicious PDF — malware analysis report

Static analysis result for SHA-256 2011eabfc8c55efd…

MALICIOUS

PDF

72.2 KB Created: 2021-08-30 06:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2eea7c74f58ff28920451d79c66512bc SHA-1: e562f08950e7cb659a2c31399c478a89cf7d3689 SHA-256: 2011eabfc8c55efdf3f8135828df43f81f8a4fff23e1fb12b03c3b2c32f8dd6d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier assigned a high probability of maliciousness. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=workplaces+to+show PDF link annotation
    • http://schodylux.pl/userfiles/file/85960859358.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/zimuguzodepaliratavu.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/64714370298.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mizefarijikososik.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611700cd530fe---44069620293.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/motumem.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qor49pmegk4l02e48a2d11vu18/94171803996.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/wogil.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/rugog.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/guwubakobuzinosisozizob.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/99930069155.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce48b665f---35711575168.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2724e364af---52205024383.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607031dabb6ab---70638568078.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ccf282ef---gasipavogedewuxi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bfe53a5ff0edc735da0a50dcf27f1a03/pafixogisezaromom.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/38c1543c37c345cc5e41ad45be626c67/34325166845.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/509sq32k1u6rdjhfmops48lhi4/gesuwiwawokuropatez.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zumoripu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/86adaf61e275161e57d2d524f08bedd5/vezadowagitewatakizafuk.pdfIn PDF document text
    • https://icbacademy.com/upload/files/22034002721.pdfIn PDF document text
    • http://chayka-svg.ru/files/kuvizax.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/nololuzuderitefemi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f67e4d83fa0---ketigo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/39195760958.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_off0000beaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 10444 bytes
SHA-256: 54357ae1b8f41579d9dcca7fc576deeb3f438e8c88e1fbb0ec16c4322dc53de5
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 14500 bytes
SHA-256: 86af72d17bdb42ae9a6c91dc6a57cce2a5e2fe3ae49360a5be4efc1d03d3677f

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