Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5b0a8528dad67d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-22 13:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4bf16c0af4c66a2a1697e1391ff05340 SHA-1: 31396a7b8edf2696e3e8eba434b6841020b27ed4 SHA-256: ec5b0a8528dad67dd5d7fa34a2da5a5ab1da95bd8ee84d023f34d44e91f87184
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asoriofrio.org/ckfinder/userfiles/files/36147302681.pdf In PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/nuxafusovitobodifefeb.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/48742689175.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/gabunarazamix.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/vikuzixiguxizi.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/guzulafunelarepomude.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/65060334909.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/26240761894.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145a5048ab1c---meputexafawufa.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/71300995775.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210907110006.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998cf3738d---xigiru.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/mawerejagafobupoxuzem.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/36933610435.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zokewusitok.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/sudimowulafupibone.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zeranumul.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bj1ekam4pvrjchq7k4d33107mm/tusaroniwakapu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/de3ace85bc74a7a71fe91862f4b2fe3f/44450712301.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/fukivaxixerufudowere.pdfIn PDF document text
    • https://baongochoa.com/upload/file/dopizakomexikizudirapox.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///gopidatinejanitajakiwul.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/nizebowekijajusupepize.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/704002884.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/50338531489.pdfIn PDF document text
    • http://sinners-party.de/media/file/37256402375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=where+is+my+microphone+on+my+android+phonePDF 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_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 10744 bytes
SHA-256: 60580e24f3a3c017e8c2df8b3293c5cbbfb17eee9054270ffe3a47d55b90a351
font_01_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 17800 bytes
SHA-256: 3c9e1de07d97739ef499d2e187790d8385fdb512963c97fe03ecaea2b41dd670
font_02_sfnt_off000132c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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