Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aeccf3287d442c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 10:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d67f38c8fcab56b575558eecce09e61a SHA-1: a454428e887ec2a4c96db76f011baf3651303d50 SHA-256: d5aeccf3287d442cc448e4f6f498a1ddbd254d5cfd9c0db726d8fb0672ed90a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The PDF also contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malware or facilitate phishing. The presence of embedded JavaScript suggests an attempt to execute code, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d355d5ff8a---fiwitixobimesuwuloturum.pdf In PDF document text
    • http://nuovojob.com/userfiles/files/wokevuratol.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/jejilow.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/90372122626.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/62290675282.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/51135312345.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/sivigemo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7e4aae12558c772f64ebadb4c55ea0f9/fiwagu.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/senilusef.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/47061571841.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a05966b24d---xixaxenofumix.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6093e873ef8205515fb0452a34ba103e/31940114632.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/piacpo1rte2cmhh90vpcs41h3t/vesomaloduxetifimudusi.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/xudusiwule.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/99061907874.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cbe2bcddb9732e80822700c8875e74e9/sesadurabopiwupawun.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f5dc0e34ccc3a3478eccf68f96ea5de/figotuwiwanagivopulajenu.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/vafasuvavozim.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ade5fc2b65e6a62fae6af8f12ee0f5ad/mefukawimunavilofef.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/jijesaf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e652e4c1f242416bdf53fa33999a5204/zonuliwikofudi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729fbce3d80---jipasijibinudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ksu+academic+calendar+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_off0000c1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D7 10656 bytes
SHA-256: 926897f8e04d292f6bd3cfd5602cfe1764bceb9e355d51f15db8ad0784924ac4
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 17252 bytes
SHA-256: 4133600c7dc214d5560064c8fa0c0e2e458cd326635c19a3320c30cd7780fd66

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