Malicious PDF — malware analysis report

Static analysis result for SHA-256 c736009d3e50c220…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 12:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f01f2a757901419b497f728109a94c61 SHA-1: 8cde96e966e2acf96bdc6f60d62ad2489450f076 SHA-256: c736009d3e50c220e21c52c41ed9f7f3c99523dfaddffb46906575c9c018ee32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself, which is generated by wkhtmltopdf, further supports its role as a delivery mechanism for external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=snapdragon+662+genshin+impact PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376fae1dd02---51813331651.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/tedegijopekuzitidupuv.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fidajoleba.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/42147016865.pdfIn PDF document text
    • http://punaide.com/userfiles/files/jolewigomuzemuse.pdfIn PDF document text
    • http://livestocktool.com/d/files/molusupovugagadiredarewo.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/87397281708.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/33421222606.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/nufoma.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/45991420682.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/22935306938.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5cc61dfe---nezewigurebodisabojenada.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/56026627726.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/semopinogigupesolutu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/22439189658.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/61089429379.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/vepikakasokitom.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332ce6c26fc---sisagoboge.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/90590976683.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/kixitaru.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/63945161033.pdfIn PDF document text
    • https://anakmeong.com/contents/files/6785524204.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/zatopodibewafemu.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090914442623.pdfIn PDF document text
    • 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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 17992 bytes
SHA-256: bf6a6c660054d24e5ed2642369e463a735239c147d1d616e0a6eb730844df0d1
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 11276 bytes
SHA-256: 224cef5787dc86efea69927f60271c0c80ed0c4aa5f578be8b5086eaf0a93334

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