Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb02525323de7121…

MALICIOUS

PDF

85.5 KB Created: 2021-08-15 20:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd564a919d8c6722d9917f4bf89bcef0 SHA-1: 120cc63a8e1ba2337cbd6d9477b976ed8306f2df SHA-256: fb02525323de71218f1a060365f905007860c902a79b0ee8814fe457ab7654c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised websites hosting other PDFs. This suggests the document is part of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ckmusicdesign.nl/userfiles/file/21030905442.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609704b68ff6d---95475881534.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pozegoketarotukidon.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafdc978513---10668306548.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082361bee91f---39121252605.pdfIn PDF document text
    • http://absigorta.com/E/file/40509173746.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/36921921861.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e97332699cd4cf20aef10ac80c6becf/38294085839.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f6d26972---laripubowodaj.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8e53e8fe5263c93cbed88452b49b3666/77188714627.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dvgprfeip9d93rkr18eh2um351/9334033903.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/50284464893.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32f14627f6---wovivowa.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/xenitajogawimodebilo.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/rorajasokifoburuzim.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5uo18kptoo48guf8loacn16hph/kesidolobad.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/10629340132.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/712402c079d57ca52072061620c84b89/78506020816.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/76325882020.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xofupokozotadadibaferul.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608665f291273---veleximokipavut.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/nitepisut.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/mokejosawiwimew.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/549031869.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jhofak29j9td0f68tttqhntf82/wokigepixereripoxuxorafa.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/gagubitovo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f194875e1d4---92909053674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=plants+vs+zombies+1+pc+free+downloadPDF 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_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 16892 bytes
SHA-256: af02c49644a38556bb61bd7b7f0e03bea9f832ea4271049e9c31e78f7b56c165
font_01_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 11188 bytes
SHA-256: 22bf8b1abcf420819f97b727f58fa0c089286f4ea525c876581091a465df1c89
font_02_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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