Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12985e068b85e54…

MALICIOUS

PDF

92.8 KB Created: 2021-09-03 10:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fdba00222e137bf6e910d23fc6ee33c SHA-1: 4a5aed8809a434ca4e19b37ac6fd09d5480be294 SHA-256: a12985e068b85e54277b0c90e7043b74dccef9a9e0375671565c3fdf6030bc5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, with several pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to lure users to malicious sites or download additional malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ampletrekking.com/userfiles/file/50493147279.pdf In PDF document text
    • http://otoozevran.com/resimler/files/ribikawenu.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/62354064833.pdfIn PDF document text
    • https://swiz.eu/files/editor/valatafigezinofibireme.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/91b4c5a4d3c5e1db5b8fc8d0afa0de10/kedobaxewamag.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/83456309831.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8fc926637---10014367120.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8c26d7fe3c0f590562e54d11e1b83e98/voxakovovagujutitepel.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/17485519752.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/96341648042.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/jewozuwunikabu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33374306740.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/83973936198.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/73500671492.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f615d4b5d---gubakoga.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/nunopoje.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bd0bd6f4---nadeguxa.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/dijonoraxidufevopukajav.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3a11da098---34745799755.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c394eb280---rixitavujadu.pdfIn PDF document text
    • http://metallpress.ru/files/51688063974.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/27149113432.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/23809757317.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/budisiromusuvivodeve.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/804b74ea5d98a1e8e96d6e12edaec013/jejelorefuletawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=transformacion+sobrenatural+guillermo+maldonado+pdf+gratisPDF 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_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 19744 bytes
SHA-256: a9672e3eda54f006030e33a5ded2957d5543e2aad6bb365d9011dd9015bd9aa4
font_01_sfnt_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 11168 bytes
SHA-256: 55a374e7161bec68dcb761074279dbe767eac76533cbcdbe9309adba74a68cb7
font_02_sfnt_off00014b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1