Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18435cf3b549a87…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 00:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05861abd616561f46b52fa75f7ed57e6 SHA-1: d25059497f225cd8571f3da14830c93df0b33f9a SHA-256: b18435cf3b549a879595b3572b2fe03ae703fc9a2e98bd3962a56d29999869c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document utilizes an invoice lure to entice users, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous links pointing to potentially compromised CMS upload storage and disposable hosting, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.sanjuktabanerjee.com/fckimages/file/fasosukuxusodimej.pdf In PDF document text
    • http://creatinglifeoptions.com/userfiles/files/93778444396.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af89a254091---pebixoxiteguxuwam.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///66867802261.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/rizomi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21752c0cc---posefenaxamisorufosomi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161270f3d2cc21---zipuvupi.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/tawamajavutate.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/781499d160b91d2a178be4908e8d068e/vupisepalubunapasaj.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/guvisiwu.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/momanodiviwidajigofur.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/89d02f97b539b3f665d02a4822b2d971/16336610030.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/52946996301.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e06a0745461---48979303292.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/zodal.pdfIn PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/18091068098.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kkal1iks5ck74q4pgprrlp2bf6/70590466537.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/bcedca9a4c7ebb8a0a8ce9db9756551e/bokakarumirumufariro.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/nofafegisofem.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf972786f5d---97948160064.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/d76e2e3558174a9d6f2e8521fcb87668/remapokajineko.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/75888d57bb19552517b275f561e0f97a/46738190446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=adams+contractors+invoice+pdfPDF 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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 10780 bytes
SHA-256: aa0cc2c8c1e4f8c37ff25d0197eff6f5539400f1338fb935647ce63eebfae36f
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 17712 bytes
SHA-256: 15030e944e7292440116498a8b11e9aeeb54dcce5d0989dd24e6038ad6fb3b2f
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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