Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc66191d361cbd5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 17:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 811b141d50b09f8ff4fe6f6c95a3556d SHA-1: 0ec1eb547e0690627c2433cc610a3eff9d716735 SHA-256: 8fc66191d361cbd5037f4a812df65ba8824a04dc3b0817d14f5f67412e7867f7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of embedded URLs points to an attack pattern involving external resource retrieval.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec9ecb910---5472549397.pdf In PDF document text
    • http://juentai.com/userfiles/files/lemuwujadobunusuzomuma.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1df75de807239feb14dc93318e81fa1a/92202476177.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b7ee13a59c744c4214269cb571907642/61496997718.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c2c6dfd9811ffaad8f4bf14d315f0d23/dejezadegazolusomiwe.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/61440461207.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f58634a9fcff4cbc69a7283237dd69c0/xepogugexijesadowidaf.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/99264993857.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jidazuxibuzexivamexaxog.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m0rmsbfuqkea65aq5uqn45jkq7/siduximazetifil.pdfIn PDF document text
    • http://rafaelokazakov.com/file/31903158598.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/46808466195.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/23715721160dcdee990edd.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d8cc3lr5r7epl4o8qcccbqkrjj/70721762247.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160878875ee513---92621951300.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/7374240551.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///96280762197.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9cd52a286ab9a259951e94bbbc0923f2/padakamiwurafikejefip.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161199338cf706---88536514595.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/gidojigadikisirunewiw.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/dazalesaf.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/99041587577.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c4787a426eb7ccbb59a98129bf9ca3f3/xisavar.pdfIn PDF document text
    • http://nktrading.qa/file/files/lulesumomofesuwapiz.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43152636089.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/satowus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=preview+combine+images+to+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/42784802984.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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 17592 bytes
SHA-256: 9352ab4d8a73ac44ecbfcc6b42527dc9ce1c59d991406da3ba891cbe702cae3c
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 11212 bytes
SHA-256: 00575dbedb8033d0bd3494321de966baef5fc01b210d908d026632bf4c12a434
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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