Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a82d8641bfc4b9…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 02:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc28cb9c839bcea412409b16cd94dc71 SHA-1: 82c96cf5212c35182210ff17f172f4c86fed2ef2 SHA-256: b8a82d8641bfc4b936d047bb4b258a50548f94f8cac3b24f19b85bb53a3d368b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://supermarketdv.ru/files/file/39193478484.pdf In PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/begoradezafidumomep.pdfIn PDF document text
    • http://punaide.com/userfiles/files/46658046973.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/tikato.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8bec4336805d4749afc283bda12e7574/30609768410.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/63902629008.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/60184642882.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a0947c864088f1bb402c8a4215d091d9/63153988596.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xomipibuvoponinonaguwok.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134656cadd32---muletosomugu.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/jixatowavanitopegu.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/99655337782.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/59043292455.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/faxorevelogubinolupim.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wezafewo.pdfIn PDF document text
    • http://climtech.com/files/files/rojerivoxilisaru.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xotizikimuv.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/78827898722.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86211452454.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/63948262958.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d361d470---67308701127.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/juzexomup.pdfIn PDF document text
    • https://virker-ikke.dk/files/19940019318.pdfIn PDF document text
    • https://mytopics.it/uploads/file/ramafimilijekogik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=samsung+galaxy+a11+vs+iphone+11PDF 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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 11008 bytes
SHA-256: 1590c0fe14e41001cdef737ffc86127722e0a136c38a4e813c99b00e65ce332f
font_01_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 18876 bytes
SHA-256: 7de825b21e6e499eeb01519ae45cd16b1af1eaed2b1a07914e92ff16101a0335
font_02_sfnt_off000130c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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