Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6f51dc012a080a…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 04:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6c5130e1caf63b1ae6f9b0465a6adfd2 SHA-1: e19a6fddbb603f82c6e91d7e242d058f17ef1f80 SHA-256: 4a6f51dc012a080ada13786307841d2912f54564a063c2621ec13db22e690dcd
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607584adab94e---548902160.pdf In PDF document text
    • http://dataction.org/demo/dataction/media/82282773179.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/5psp40ggemo18rm92u856220at/28058837349.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/zasokutavabazulow.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/faluwilijatos.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/gukiwejidobudinejo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/47aac848e5233438e4b9bf0293354edd/gazazexeke.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f28762bb6f---xitaminimenizugoxefim.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/tivuf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160901a6df0fbb---83880815893.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/firilomipidanejuzedatulus.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608240b458d5a---fovuvolizomojoduzuwibevaj.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/66734945022.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091150cb200c---zovoveriwu.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/dijikolupiwoposovez.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4e349e39e473161aa16fdcbf44d70aa3/24284005941.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160895d743e389---majunojoso.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/fukuleferijitasokoka.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a558df45cd72e372154575037c823d14/45948882368.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a23ce388---vevevuw.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/36677708845.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e91970d8---28592467790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=past+time+meansPDF 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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 17704 bytes
SHA-256: 33267a97c82399204e99c8ec12ede147358d93b5f6419f1910eb0062d497b57e
font_01_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 10004 bytes
SHA-256: fe5f7f5e8eb5c6a098964f1c9a0fb88bf121766fffc8405934cea0fca292f72c

Open this report in the interactive analyzer, or submit your own file for analysis.