Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18e4fde038fc443…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 03:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5492a90e02ecb15d2826d5df4afc8850 SHA-1: e755fa6f79cecc0df49c2c0300b2944cb7fab8a1 SHA-256: b18e4fde038fc443062e007a3b893ddc8e761d6a946c21075997169e501e03f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm pointing to various domains, some of which are hosted on compromised CMS platforms. The embedded JavaScript stream, while not directly analyzed for malicious intent, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gleb777.com/fck_upload/file/67220785913.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/6191829819.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/bubizosofukimixonekivijo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef0913fe1---76452724191.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/demumezuta.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/54424814235.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/53203089349.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/rusakifanekifa.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a57ae0de191f51697f57a910ab5d8f84/47971939138.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/85102452971.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/15529413188.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/56411083496.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lipoxiwuvori.pdfIn PDF document text
    • http://zgic.ru/!upload/files/pedoxewosew.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/45644877801.pdfIn PDF document text
    • http://saaretravel.ee/images/file/65509736126.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/75201952192.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/59344146131.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/13842372564.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/59059245048.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/82389764604.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1bea93a8---48995723703.pdfIn PDF document text
    • http://flirdining.com/uploads/files/42475507162.pdfIn PDF document text
    • https://polaria.cz/images/file/waximif.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/60101544548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=call+of+duty+modern+warfare+pc+2019+torrentPDF 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_off0000c325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC325 16884 bytes
SHA-256: 80cf1161328151c2eb0f126dd11f3cd88757527fce353bc15e371df574b26a3f
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 11316 bytes
SHA-256: d32c060c6a7d4a23b4df52206cb9de91b5122cdd4967e519be6dbc15f44f6760

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