Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c6a5d4fe237e3a…

MALICIOUS

PDF

120.5 KB Created: 2021-08-08 15:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4f99cdc652559d449449b0b2fd1551b SHA-1: 9027f54239be74e867593b766073c09b0d7a59b6 SHA-256: 27c6a5d4fe237e3a6f4d9969448ca32045432caa825d592235451204a914d3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://taichielite.com/louis/taichi/ckfinder/userfiles/files/pesufikuxulo.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e7e556fce1eadfd406357a8a5a94d12b/54580613072.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/nusoj.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c612c28ec86---40263483709.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/jifupovogad.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/dalewefepatararuriseged.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/bezanoveraduxujix.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/87586327417.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/34685528100.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0a3e62f3dcf0139f963fafaed207b132/zudule.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374bba05f5---wawedizafekegolinak.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/67b6805fa97384f0b2ffb5f4a8939566/gibubokaso.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2abb84d48900387a313e4eca05a51ec6/nofokizuzowuki.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f188b9b4820---salixubulaneketipal.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kegobanedosadi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b261ff6f6c242458ba3f6f4c86e1c43e/35234647057.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ousd2qhbq7ni2uu46a7c0hjte7/15445689878.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/66684466058.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0e3a5958d3---pupogivivefune.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/31181205254.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608053044d600---15106750990.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/batuluzobumavudusaler.pdfIn PDF document text
    • http://samtle.net/ckupload/files/94332662198.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29456577846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chandramukhi+full+movie+tamilPDF 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_off000174c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C2 17740 bytes
SHA-256: 07b9ee593703b09b81941ba3bed751306a0406733a01b2babbed9b416ee97493
font_01_sfnt_off0001a308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A308 10740 bytes
SHA-256: a75a0c930024e8248a3a8e20d4a076544b917610b7bbc41535661180bd007418
font_02_sfnt_off0001bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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