Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e773cba9cfd02dd…

MALICIOUS

PDF

83.8 KB Created: 2021-08-03 04:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 085d4b4490e29d0b3ec32fd4d958be1e SHA-1: 1b351d2e6acc6371578424995622688927aeed81 SHA-256: 9e773cba9cfd02dd13f5a2a25b298a474b1c76ac50de04449779a03a6b61e1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099d20ee3748---1385671507.pdf In PDF document text
    • http://wakarusavalley.org/userfiles/file/fovitogomujodig.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087b311af2a3---betuxorixigopunuf.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ea71aeef5a950a2191164b455f986d5d/zixefusupugudubolidizesop.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/vuxizozisijajukewiboxi.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/21822771257.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/idgm851ejv3ne6oa60ev3bjvvf/gobatubemow.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bl3m2rin2fgpoqldgi98q32374/mekujoladigoxu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08e4a88d7---3608044552.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9b44072a---80945174164.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/38341103010.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/66326310314.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8b2bbdbb336c99478c223e0bc913ba8a/vekawowisumedis.pdfIn PDF document text
    • http://limoride.net/gallery/file/sodedumagepevoloziposuk.pdfIn PDF document text
    • https://eventaipei.com/upload/files/69659889831.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/75006306448.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/23603889856.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/nitigunowusotiduwur.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/67855513427.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cilbnj83oa17ira8gmfbk6bpr7/bizozupekoxa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9832ee98cc---41035348616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=un+metro+cubico+cuantos+centimetros+tienePDF 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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10592 bytes
SHA-256: 069c3ec98025f5538ad6674d594fd6fc4c4625fb2c35b29cb279255168c9e8eb
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 18536 bytes
SHA-256: ded8343eb67c3ed64c6352d73ab23912fb45230fa66728c6379aed29ef52b3b9

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