Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e54efc04fab3699…

MALICIOUS

PDF

89.7 KB Created: 2021-07-06 01:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8de7c750ec74361a9b37a209233601d4 SHA-1: 6f99a4e7972e21b0f456df665b850edf79bf5e24 SHA-256: 6e54efc04fab3699fce47bc6bec7f22dc59a37c1361dc83765967afa6fdeda54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate further exploitation or phishing. ClamAV detection as 'Pdf.Phishing.Trojan' supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://thaimassagemodel.com/ckfinder/userfiles/files/dikete.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01c59aa0d6---dibufipuxa.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/8746986620.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dc1ec998a4cae074455e0bc893d6346f/50796977149.pdf
    • http://gayaarchi.com/userfiles/file/20210703011858.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/31aa7ba746be0b0fc5ffd1edf3ce47ab/tizunikabovaz.pdf
    • http://chnli.tw/CKEdit/upload/files/73882471249.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210619225654100.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a81684e3---39435052408.pdf
    • https://digireg.com/upload/demog.pdf
    • http://ubest.ru/images/file/puwodegusuwetigopexop.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/xuxume.pdf
    • http://technoauto.jp/js/upload/files/nugiberu.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb784c5bb2---xitomexiwedumonasenugimeb.pdf
    • http://biaikatolikus.hu/files/file/walefidawotefulu.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/49945cd6930b2aee8af8d873fd0ece8a/zuzopa.pdf
    • https://www.mds-horizons.com/upload/files/tepuzovoxumoniripuki.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080d07059c52---59150016107.pdf
    • https://2acontractor.it/images/file/97905494021.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/21b1762464603a751bb011c1862dce18/vurotiwelixewi.pdf
    • http://bright-inter.com/file_media/file_image/file/9191776754.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30deed3fa---nanuzeleniposozunabi.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abb459876---36450962934.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095fa743babb---funawowapilosexobava.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f96f710e7---51943386599.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/63j491s8qhoskqaq08pri0s4p3/nepagixujawek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+solitary+reaper+stanza+wise+summary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f961.bin
ca1181afd74ea9928225e424ad91f8d543d97a1d8473d53046b8cbe05ee74b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 10840 bytes
font_01_sfnt_off00011256.bin
1daa70b717750752d0a325d86a8f4ccded0e510e9088875d4a99bc1bfc20feee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 17260 bytes
font_02_sfnt_off00013f12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F12 16792 bytes