Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ed9310dcac3ad9…

MALICIOUS

PDF

101.0 KB Created: 2021-07-31 10:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ea1cc39798d112a785e4986f265279f SHA-1: 87af2f62d4ce6f0ddff823cc29e793a3d975a65c SHA-256: 26ed9310dcac3ad9ac8a7aaa34861d4cafb901feea6f8cf5181607004551b151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or conduct phishing. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous links to potentially compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://scuderieverdina.it/scuderia/userfiles/file/tufariwaliwufaj.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6457e4bf1fd6217297acb966de602557/22598019638.pdfIn PDF document text
    • http://www.heksan.com.pl/file/95208166845.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c17c66a14---71312214906.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b366b807---60502690741.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/jiwalulapiritepitasibore.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/padafojaruzovata.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6e086c6f---37581966786.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/32285669475.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/77587829662.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210706121644.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc440e5c---28339326869.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/45743867132.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bc85gb4pn96np8ebtvoss9dcs7/55548398832.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/rurabamoragaribemiru.pdfIn PDF document text
    • http://edgecs.net/documents/28037508932.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/50318784835.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/subev.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/sowojurumukelu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c476bd630f0---37863609395.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/57362075406.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7024b74d---37747083107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=collins+scrabble+dictionary+free+download+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_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EC 19336 bytes
SHA-256: 3396f09b99d57655336c43ed2dc945aac4f5ac74be1b7584bab779feae70726b
font_02_sfnt_off000169e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E3 10984 bytes
SHA-256: 2481f75c6c65f4cf0de8e06f1bea4eef8862de5e3990284ea922b8d07f22f5d3

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