Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a571d0f1d7eb8df…

MALICIOUS

PDF

77.3 KB Created: 2021-08-29 16:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9daba4ae1066da9fc88da26198382e8d SHA-1: cd234092ab916d5e3a5da5442d91962ac3a16ba7 SHA-256: 5a571d0f1d7eb8df75146154cc7fc5499bfa8c2a8954d8365a689b3a240655c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vamuwemegujuronaxusakuza.pdf In PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/07/file/20210707_080900_114.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/6256582060.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/zuwavodagusagimiribe.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/61c3e750e504310bd121c665b56230c9/gitinokeposos.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e574ee1022---jevenofejoxeda.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/59190180655.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210726_045942.pdfIn PDF document text
    • http://abworder.com/uploads/files/wagerotunepaxomuto.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/53771324612.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2fb2de10fe8abbac11579fe0b09c5678/jozixotafuguxipilobazuw.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/46474559616.pdfIn PDF document text
    • http://timapools.com/uploads/files/vorata.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/92f96b9509604e97ea1ec59a57f76f2b/fuwinatip.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2586c820725984a21888a4928df7b0ac/milojajo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ie8cnicoc358gvd7u6sljuhv17/bavenemuxulimunol.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/22381944438.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088897babf81---36801194211.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/83fpjtf6m0jubjcpcirpts407b/pegunefemivegux.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/miladelefuvode.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/duxatedixebanuwemap.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/nazipul.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/gesame.pdfIn PDF document text
    • http://chapelguild.com/images/usr/8787950925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pubic+hair+after+50PDF 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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 17540 bytes
SHA-256: be99e8dc2b4f4ca2fefa2e4c49be495d4cc8e84845c9daba0abaa81ba05a31cc
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10492 bytes
SHA-256: 25c3cdd08e4ee45186236a4fe9d777691c16e8da6b1a1650bb34392bac57dd26
font_02_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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