Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d88953311593c17…

MALICIOUS

PDF

97.4 KB Created: 2021-09-01 16:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9111b10ecee8d01faf2d8910d088d0fc SHA-1: f5d5fabc4d0548b867f331cefbe7c9de5d9c0350 SHA-256: 9d88953311593c179a9857dd211a80b5dfa4fbe95694f404eebba8a26da3fee1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links point towards a tactic of overwhelming the user with choices to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://circuitoinsulargc.com/documentos/file/puvaridimujalabod.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/68bc91670c5c8a8cb50cde01c24ace00/figezuwezoresig.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pazisalatafefo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608868800049d---tufulemojepibepifofi.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/34159434352.pdfIn PDF document text
    • https://buyafranchise.org/files/files/belujipavopajo.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/fumopub.pdfIn PDF document text
    • http://labotinnghia.com/img/files/wegolotupe.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/uf74bc4osraj4ne9eirqeijv2t/vavewipidon.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab02af709---pupetobuguwewexenobedir.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4e2e36113cb7b5e5c4b7a59d9fb1c3ad/59520529988.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/81156803816.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/mps605ag8g7vm27cqft74sahjp/dejanilefegibilomazoro.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1153ea44---10156453548.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4fa5fc9c---wogizopawonodubu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/aa218f6f677bea324c6f7df7eb1c631b/dovaroxijivelopepava.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/lifajeviliniri.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/kibavozadu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b5dfb17b0f5d5deed275114b4b61bdf5/2221679782.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9f3111ec75466455245f62d4f4b48c0/sanonariwoviwalozimenogix.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffae1bc69---degazokezedumalep.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bec6be172---rukuxupiju.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/nuladigeduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=this+is+a+short+nonfiction+work+about+a+particular+subjectPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/719672da6aa5cef479329fcc380f2478/venifuv.pdfIn PDF document text
    • 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_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 11088 bytes
SHA-256: 328d603856855b3778b7ceaa4af9c5cea8cf4b1af4b3309f4ba1179693b6e9da
font_01_sfnt_off00012cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 19360 bytes
SHA-256: 0c11c63c0b8fdf1b0ada77eca3f00e838f2c35f3ea078c5d55b0f9d69d0720d1
font_02_sfnt_off00015e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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