Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bc3bc7a3ec74bf…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 00:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 079c95798516b4aaa94f061e9afcbbae SHA-1: 186f8434b3f54578ec443505adc683cc6b0530d3 SHA-256: d9bc3bc7a3ec74bf5443f908f23b7b0c713fbb928ad84208c66cd1e6c45567df
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vrcd7jo1uog1qrn1tgdriabgs4/ratedujawakuda.pdf In PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/63947666436.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vexadexovesegenux.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/nuxajukasevikilonivopor.pdfIn PDF document text
    • http://lejuriste.ru/files/file/28957001960.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/55673245640.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/92935635587.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/14741773982.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f4ea33fd---netupekibelovukarovu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea764ed45e---32350217948.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/joruwiwofenaweganeju.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/belamanunekomopifagab.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/24236241781.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/7351996933.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909142358419812.pdfIn PDF document text
    • http://abc-tel.ru/data/File/kajunoxanani.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nesug.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/49954115425.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/zasomevat.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/jejabavenubagiso.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/liburinajidikididera.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136026dbb232---97608206565.pdfIn PDF document text
    • http://planbmedia.hu/files/81278201434.pdfIn PDF document text
    • https://trieurodata.ro/images/file/48415127252.pdfIn PDF document text
    • http://delve-cr.com/uploads/watukaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=piaget+theory+of+play+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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 17668 bytes
SHA-256: ce88a19245d71c8bf8eb2fa43d220bf6aacd35fa663b34f24c7b7c82380d8264
font_01_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 10620 bytes
SHA-256: 04068e129b9bf8fde36f455cf13c567baaddb0b92b18a1b9499d3fe41d69ed99
font_02_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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