Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8ddcce78dc4393…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 09:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 077df56eeaa971b3859b4b78043c0abf SHA-1: 9993a4d477638583cf254ebcc5d4e625781225a1 SHA-256: 8a8ddcce78dc439305d389dbe0f26c281fb838e323da789ba47c68bccefba1e4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised or disposable domains, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agriturismocorteerbatici.it/userfiles/files/devikegebedigatawezig.pdf In PDF document text
    • https://dongphuchuytai.com/upload/files/dijiwa.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/22156553323.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/5338946960.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/kolewexasudo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/98b60fcfdb805fdb63a32da3d8ec6166/22834103001.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/98023769156.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/pezevuzovuro.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jejokutejenowiletawebavo.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/pukemujugatowefoxi.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/lifogubadadufoj.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/11246076670.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f79603da8---savolixureregedumukafom.pdfIn PDF document text
    • https://filetorme.com/upload/files/38212354130.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/peleni.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/45949208935.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117974595769---juxibuzisajefe.pdfIn PDF document text
    • http://proxima-design.cz/files/file/jugax.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/suriku.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d052c715b1---pudurogiw.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/88009806115.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/binimozobigatefuzinefexal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=msbte+geotechnical+engineering+notes+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_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 17668 bytes
SHA-256: 19c4d37c2bf7f425069dd2b88742e2a14aafcb98ffee17c5334ad2bdd0271634
font_01_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 11032 bytes
SHA-256: 6a145409ca2f4212b4130269d3fca403e8d51aff19086569e153ee57f10d351e

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