Malicious PDF — malware analysis report

Static analysis result for SHA-256 df40a16aada9bd31…

MALICIOUS

PDF

90.6 KB Created: 2021-09-04 18:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49ce484f6e4022d7cba6734322cac4c2 SHA-1: 772389d6ab4df3ec279708194c0046afa74a59b5 SHA-256: df40a16aada9bd31ac9a7c32cdba4096db0ace3633581d51592579d8b99cc4a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing pages hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/45882807801.pdf In PDF document text
    • https://llsindia.in/FCKeditor/file/23851208345.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/penipitulu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f41b8f788---sivomuwejovez.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8b1a87a87e733b880d9fe2433bd59a95/bugolekeninazapokad.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce321598e---faletixozataromonisumas.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/puzukisonikuzezanev.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/29503244130.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mazojavoribezamidolinilo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/delel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c019e9b6ad---80366577489.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6835cb1688---dasetu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/kexomefuvemegoxelipaxel.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/joketirujodaga.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/48239902176.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/48830903720.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t2sfa7sesfoipvtua6cufc7340/zemubemawezatozojuxiditog.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/78213606871.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070934747202---mepumafa.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d023d8881---wodazojafokux.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078d37039baf---jadavobu.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/relevidu.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/60515411352.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210719064315.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/84051421887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=exercices+corrig%C3%A9s+sur+les+filtres+passe+bas+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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 25276 bytes
SHA-256: 87099a2531a69fd4a37f423fdc33e579770c6922ca22c44da194c9075843675a
font_01_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF6 11172 bytes
SHA-256: 22aed1132b9c09faaa4d2cf883b702e7b0a719b4dbd77e5e6a6a723621b19554

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