Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9dd5c184d701a4…

MALICIOUS

PDF

90.9 KB Created: 2021-09-10 11:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 843e9729226ffe9aa5433d417cc71a7b SHA-1: 0b5ed1ccc00eac9d153cad460cabf0d6725ba5cc SHA-256: 3c9dd5c184d701a49352da6cd8f5c987990d86d8f6c406fd630dbba460d3b489
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of numerous unknown URLs suggests an attempt to direct users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://sangolongphuong.vn/longphuong/news/files/kixodusikironebibon.pdf In PDF document text
    • http://zatuchlina.cz/upload/file/sakutosapedijitibin.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/gedukitoxuvujamawugurokox.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/ropenelaverevadik.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/68101277397.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/befawejideludonije.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/kotofuwajejamo.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jobusasef.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/43137445675.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/313c7d9e650f09a55dfb2892552ca06a/sosutimetijajubo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14234d14---xusowowesuvogoxipa.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109080136537147.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/29394142122.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_7D4903306D479184.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365da5385c0---96551832194.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/zurasejasofivixumomoviw.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/39110393206.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/wewivozibeje.pdfIn PDF document text
    • http://kustari.net/userfiles/file/pavixekobopatorapot.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1de14beb---kufuluf.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/ribafexuxizewowotakero.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/72469721759.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mefokeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=life+of+pi+chapter+summaries+and+questions+answersPDF 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_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 11128 bytes
SHA-256: 9b4a2b055a524abf835cd03228557df3c549d4eea459b5e64d6ce9458f7bc2cf
font_02_sfnt_off00012cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFB 18960 bytes
SHA-256: 573bcf44f4e548eb3a0e71287d77207f524591aaf603039e7327e20c2fb85165

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