Malicious PDF — malware analysis report

Static analysis result for SHA-256 eada1d08a958080d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 15:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1057bc8c461100b45b79c1a3b667ed7f SHA-1: 67f2894432f6dc0b6f8ae8433fa481e959bf581a SHA-256: eada1d08a958080d72ff54daf27abe855ce5c38ccf8de9815b22e255eded3ae6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://koryosushi.com/uploads/files/xaxamelatuw.pdf In PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/53105958098.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/95663f3a26f8f65561932e56492ecfa0/66345812659.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jfr7ifnk475akdt5234mlbevg6/gaviguvunawaduvozilodex.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dhsv55c860ov6rvpmrje9jo1n4/92604327833.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6bh0gmpavilleg9rtipmn9ddpi/belijebafifanodisekukima.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7tsto3a5a1f9a4tmnku1mbdfq2/41828531949.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3d2a7e33b6b44135dc34825141d9da9d/7789089577.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e6b2f1a8---lavupu.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/pawozozagorobudina.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9e1f2c36b---rutilelorugofe.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/paregovakakafapifosose.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/rapagesexuramawovaput.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/vujaxibinujiv.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/naxijakibiwovifuz.pdfIn PDF document text
    • http://darstin.com/userfiles/files/27760433777.pdfIn PDF document text
    • http://adveotec.com/img/file/15439974678.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/nojefinakigefon.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091efdc590e9---46165368167.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061621180869.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/gokotuxijidejarawuvagajus.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab0994d77---96537673763.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8b8da8b07e289bd3e02082f0fbf07fc/busepuxakixulekazopurik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=oracle+database+11g+documentation+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_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 11280 bytes
SHA-256: 7ab9c365f96731d5ac61115b7a5b051d3710b92f580f7254b8ac56bb81e9b007
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 17180 bytes
SHA-256: 2935b2c516be4a0cb67e9a4a9d35624102b0e5d23f214a550bdd980d4788ba6e
font_02_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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