Malicious PDF — malware analysis report

Static analysis result for SHA-256 88354980a1afdb97…

MALICIOUS

PDF

69.8 KB Created: 2021-09-14 07:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7ee3b21556bf74e07ec4552e1f94f74 SHA-1: 6624b8c8937330a0bfb1b0ed46bbfb902ff161cb SHA-256: 88354980a1afdb972d164f536005645f62a03883ca7b240e240f46e7ca9422c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites and other PDF files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and a link farm heuristic confirms the document's role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ed-web.cz/userfilesfile/xedobivuxuja.pdf In PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/lekezuvorepubup.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/47095525257.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/39064358854.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/49947745502.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161328b3bb4311---bujovusepexamanil.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131814e6132f---fitaguxitareso.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/jibulurusatubetijasate.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/pefodojanidabasuzel.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/niwukawegowogasoxaliv.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kewupupev.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/dutadepefemofasuv.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/59bd72e5fe3d69a0eab495ea36a4f84e/dejedifejaxovomimegimiwip.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/29450026377.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/xawerugavukik.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b4dee9ee382a99d9fe47dc75778f3d39/bigabosufuzawiradabizu.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bebadagal.pdfIn PDF document text
    • http://metallpress.ru/files/ronodine.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rji38e2q72gt56t1erj8k8f18/53924169820.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/80279428121.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fb98ad52ec9eaacc52ad7994c74a39c1/18783188642.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2q4vtenun2fltt8joeg6h4cji4/9112709343.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/xuriwupetunapinosisuxa.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e29d701c---vejoduxakozimuvowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=send+sms+in+background+androidPDF 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_off0000b479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB479 10976 bytes
SHA-256: 6b0763cf6c2280ddd98a8fbde7831f89dad047b8052ec8f95b4b957160ab146d
font_01_sfnt_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 14448 bytes
SHA-256: 1da0b4ad9e86abfa587574069ca1a71e49a414078a2b36acf7149f7c579debfe
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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