Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5587c350a49bb9e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 04:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc0ed64c37b8338c1aad015281f422fc SHA-1: c36611ca1fdd70bb6760de0d8e0cad2eb402f7dd SHA-256: b5587c350a49bb9e19ca7b64ab49bd546e4cc207a08933d25fe70abdf9ead49d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.urbanwaterways.info/files/domukukudelopabewapuzexe.pdf In PDF document text
    • http://rts-3.ru/upload/files/2366257039.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqpnmidpfrg855rr9jtc45tq1d/xumatovab.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/89184988768.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b43147a3e5---80674247793.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/26917718080.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wuropi.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/61860076039.pdfIn PDF document text
    • http://ccshecea.org/upload/files/xoropowisaveridaworotim.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fc2c0d52c3b90e16d35b27e0d04019ad/23330011788.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k7dc0sq8tblvkp76vnfqu635gs/sunawudi.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/geduwofetirusepiwonavepu.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jetozakilove.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/15397214668.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060902491673499.pdfIn PDF document text
    • http://spiregene.com/image/files/20210809_210632.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/mosomanimamosavajuxo.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/80001178780.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/19d12b1e99f36c3591d7710de5317449/982508316.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b8oribustrdch79ol5l19ohjb4/39732048347.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/xubimebep.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/65109567427.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/fejep.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dca8872ab---42980460244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=prefix+worksheets+year+6PDF 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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 10724 bytes
SHA-256: 5d4d2dcfc5f911ce4dda00364fdf716964cb42951f191f290056ab6688565237
font_01_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 17652 bytes
SHA-256: 706245b32f733bf17f2c0401a774fee5ceaee96d5c4533aeea46bf70af8fa77e
font_02_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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