Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c11c0d9c45d420…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 23:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bf3b43c618d4dcae8d1734d3b0d1571 SHA-1: caf10b0b7d35c7b9e299e74b49609251a1b226a7 SHA-256: f1c11c0d9c45d4206b7f8c31e9d8b36a10ac6b0c886b72c0490ceb7b7ed2309c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to trick users into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan activity. No scripts were extracted, but the PDF structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 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/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+anime+with+op+mc+transfer+studentPDF 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_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 19672 bytes
SHA-256: cbf2f50e755ce1e70d78cbc16bb9704dd9636dcd3834305d92d67e0642810347
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 11076 bytes
SHA-256: 233175f9fd03f80cb010ea678f5f44aa41f5c82e9bed59d570e24bee9277843a

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