Malicious PDF — malware analysis report

Static analysis result for SHA-256 8baff37754c51b82…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 18:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fba56fd6ac4f1f0eba14d44107cf766e SHA-1: a163af19f65c0550a0f6840891b9e319179e11f8 SHA-256: 8baff37754c51b829e078b2cc43f5df1ec695fe4416f7f5510d21cf7fcd3889e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/ziruzejanukumawazigakasuz.pdf In PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vituzul.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/9858296649.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/91529642872.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/10717918993.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/semusumuxevaluw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa5cbe02e8ce8778c2e1065d4859bafc/13298178535.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/35511638311.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xitezoxelogedotonedox.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/28047089985.pdfIn PDF document text
    • http://mlight.cz/archiv/file/tapunovamopagirun.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeeab2ae4---refafeberakibelapevi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/933e34443a210ab60d74a905094ba314/40370981943.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/lijafativaziwe.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/warixotakozotipinileto.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109131932334434.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/46285435147.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/26591787524.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/86594625412.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ffd27601921781379d6bb0be5ca95b57/nagasavisufiwilo.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/vokujefafidus.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/tavuvowigapiliz.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/43859098450.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/63786465819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+coins+8+ball+pool+idPDF 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 18740 bytes
SHA-256: 5abeaf197fbea18ed37d33f764338ec117018aebcc8187f25cff138cf018fef9
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 10736 bytes
SHA-256: ebd4c497c562a75270434b505349869a3b2316f2df988bc6c084338ee45b9852

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