Malicious PDF — malware analysis report

Static analysis result for SHA-256 a914def3eb728af1…

MALICIOUS

PDF

115.6 KB Created: 2021-07-07 08:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f9530878d9710adc75e52f436ebb9df SHA-1: 60fa494cd740a8185ed3d1a64c905abcde0de7d7 SHA-256: a914def3eb728af19d10899d81eb6d7753fdce3d1c64ee4cbba3619ddc664377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely serving as a lure to download further malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests an attempt to automate malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://muratay.nl/userfiles/file/79293745369.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6047d1defc742ec32740ee296f871d19/nerurinojamolemimi.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/87065723482.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/sasonelo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gumaduzedoziligilo.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/19545732934.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nacf99ffjtjg21fv7104c08lve/20770143798.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076856dc21da---54005752255.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0012d068e16723dad6527742ec8c7525/60821931652.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788dcb35f03---72913681226.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/40d2d73b9614e9c93ea29c3cbe61a36c/90546814028.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/80924017687.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6psla52m56u6gbsnlf8f1kmrfe/bapopimiwaremalewuw.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/15334158098.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/33833977830.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/813fec1d1e5595b974862ecef1bf0c81/vegibodeketojaw.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/817707383.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4k113q9d4jpnth6tf3nhqg3qr4/xegemumor.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/82406790446.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fa2b1367---29738946114.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf72c097b5---82761783018.pdfIn PDF document text
    • http://abpaluso.com/upload/file/47200737807.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j8okdnnl9gnifshj93s2m528n0/muvem.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46ad9767f---980291967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=interactional+model+of+communication+pdfPDF 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_off00016154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17966 17468 bytes
SHA-256: 9347bba3b0b4479880a7ed664cb8fdb686e0f2c02b8de51bc3cb55bd31ad52bb
font_02_sfnt_off0001a6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D9 10664 bytes
SHA-256: 8b3602102ec9d4794273914112e9be2709a98dcfa3cb7686029d2a5007d6bcd9

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