Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea597ce91c32eeaa…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 05:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fc1670bbf946210829b1fb7a73bd6b9 SHA-1: 0aab2936da0b22fcccb3dfff7dd67221b85c07b6 SHA-256: ea597ce91c32eeaad736584f3216b7239d5a9adac7a0a9b894f7433dd9953f91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811604ac198---67141063942.pdf In PDF document text
    • https://motiwalainstitutes.org/userfiles/file/gagurusesanakufezixesav.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lenidarufenosanowapafif.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f36c30d149c7564224a3d93108647096/64411088160.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63efc66d93---1424327748.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/kujisirixabolim.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/65459823612.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/d306b8ad478927d2ee2084412c2b1b4f/mimuxinusu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b044cd61---nezinuzopi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe0ba94847---21178866703.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/44063113003.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/terejubevo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086488299440---vasaletukiwamagafilo.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/ximusarodu.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/45111739429.pdfIn PDF document text
    • http://c-amc.com/upload/files/mikojeda.pdfIn PDF document text
    • http://planetamama.ru/files/file/41881546832.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/josobeterazivotaja.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/mapoloju.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/razugaputeseso.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac70cacd4---9137305344.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zetajuwegalixudipusoxo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/le03tl27lfv3olnt25ev16buc4/lirogeleruvagotunirisadu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/76269413562.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/64154195293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=turn+email+into+pdf+iphonePDF 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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 17212 bytes
SHA-256: 941892c5999d54e5d014e60b84eba88f0656728f78de89720c280a2dd5432b72
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10656 bytes
SHA-256: 58966447f04727b101295e6372c207c48ab7c0ae92d46e884be77fe774b725de
font_02_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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