Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b842c6eca438bc3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 06:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d545896b160fa2923f9227bac4ffa730 SHA-1: 857a4ba8ffa49905a8644a809faef0f7fff2d825 SHA-256: 9b842c6eca438bc350605ce3954a68ef41d64ed223e681306e074dc610b4771c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to direct users to various external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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 http://myblindz.com/fck_user_files/file/nageno.pdf In PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/18785939395.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/likoloxizuvog.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e288a9cf32---kogejesesuke.pdfIn PDF document text
    • http://hflchw.com/upload/file/60277402816.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/20419957096.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/movone.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/gumimugezur.pdfIn PDF document text
    • http://sung1.com/upload/files/bowebobururupasiwapele.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/32076152239.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/46840838871.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/temelizirupolumawuvejen.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7dd4ad2540cf6fa6c432f9cd4dd74f55/divefamuwilemosot.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/80968344894.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/30197064275.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/12916608438.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a67dc265---xapugoni.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/63313056942.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/jemafafuvirugeralife.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/vuros.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/risilabugubo.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/69413398847.pdfIn PDF document text
    • http://huiking.cn/uploads/file/091334362947.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/sepobixivevizazitazopofup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=while+you+were+sleeping+1995PDF 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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17764 bytes
SHA-256: d85f4a418a2096de7ab04864c96c8c8a3367745865b82d60011c33955c807933
font_02_sfnt_off00012349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 10916 bytes
SHA-256: fbaa28a17aa0e919a86ddb88107d0dd808a20d96c0334e372532be829a7f9e57

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