Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bb36dc611832d1…

MALICIOUS

PDF

70.7 KB Created: 2021-08-27 09:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3e24e27d94d63f0ca6935a21444e2d9 SHA-1: ddcd9a5b7999ee7f945d5de588f9f0e10ae5c822 SHA-256: 95bb36dc611832d1b589ea251f68ce4126cf84aa6e27c6c97a74a7e0c4204482
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to websites hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://aaaexpressac.com/userfiles/file/47301361257.pdf In PDF document text
    • http://sacoorhealth.pt/site/upload/file/73940608300.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160869c9601ec8---gemutadekojaxefipamo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/wifaxipixidizipubori.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/48464686674.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/85446679742.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/punivuxaf.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1f94e28b80c5f1a5847ce7cb08108c91/90430655348.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a2ec124e---bojimemuda.pdfIn PDF document text
    • http://epicridesnepal.com/files/32808348213.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/vonofomikafezakusalimupe.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b09221ea---bukorejelatofovuxe.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc8504153---gusesurawip.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/37986638027.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/xewovolovolati.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/26238312151.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vhom4krii88b9e0l51jp761q23/97971042056.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/93776070739.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/33c7dfae5a7c4354e997516d7c940064/lapagexatigaxuxaj.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3d61aeceebc2b1ee33f4a38845be72a0/78656296774.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/2018224982.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/55335202402.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe340d1205---venegobitov.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozajutisapod.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/62348093474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=potassium+hydroxide+is+a+strong+or+weak+basePDF 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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 11284 bytes
SHA-256: b06af31d5eb059890c52d19e9e6cdf24424d5f5ea63f07112f15d128435f2f7c
font_01_sfnt_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 14476 bytes
SHA-256: 18e83604c82ac94250b913946a31d0c8614427e571062719ec19959c6063bfd3

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