Malicious PDF — malware analysis report

Static analysis result for SHA-256 9add94a2f8bf57ab…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 15:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4662ee159c96d64f1efec88a10bc030 SHA-1: 668ec5bb40a59723affbec8ab2f006cf948ae034 SHA-256: 9add94a2f8bf57ab290f7792898ddd4ebb5306d22be2ed64cf202899b674f5cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://poketomecam.com/uploads/files/23583136034.pdf In PDF document text
    • http://pyhunlian.com/uploadfile/file/xeret.pdfIn PDF document text
    • https://negaratoto.com/contents/files/22660603769.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ampuk3455u9q0frtr4si86ter6/lofisewajawopugew.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/51467407429.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/loripixejudasosazumubur.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/84326763254.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614114b4b12a4---34511109000.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/96775006569.pdfIn PDF document text
    • https://proxus.nl/file/98291130880.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/dutaxiwefufivos.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/zomamavaxinopasu.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/mojaxogakunokini.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/soraxod.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ad2354d7203331e489e0419001d2867d/66137709978.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/pusubavubixezujenudosu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613494f35023b---60832120026.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141680895612---wukigodafudosesoguto.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210907102150.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/napimepipumekemoxipiwa.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ripulikaj.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/36525058175.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2e5beaf48998267cdb8a5b7da7819abc/3999317607.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/kijujonaxipofugu.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/20670927930.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/396419695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lulubox+2021+downloadPDF 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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 18292 bytes
SHA-256: 4e7cd01ab00f056a31983137175f853064b0edd3bba243ef6d325e845662976e
font_01_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 10328 bytes
SHA-256: 8b5f1399e5b353f10c3e2ddf61a4e6fc1b9277ef3833183a7fa5a36115189931
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1