Malicious PDF — malware analysis report

Static analysis result for SHA-256 daee4a1f49f695f9…

MALICIOUS

PDF

89.4 KB Created: 2021-07-27 16:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33d96e9edc094293c7f21ed244756187 SHA-1: d07164097be67bdaf59473a98dc2e654107d2516 SHA-256: daee4a1f49f695f9cb94d8ffe18d75ad2cb9fccf8ffdb23d4149f121e218a70b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised CMS uploads and disposable hosting, likely intended to trick users into downloading a secondary payload. The presence of a 'password-protected archive' lure further suggests an attempt to bypass security controls by encrypting the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefc68b50f---gakosuvol.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o3l4uveeu0bh5ev3cq66pqvt13/gimusuxikidubimitefo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecs4rfqjm4uoc1ngsj9ta2o1d0/46512638870.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/gakoretuvebelopedak.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ba9771448fad54e0fff3853b0558ea31/53434789847.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3928a105e8d13f97290d663ea5f2499a/nivolekogufekovivaz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93869c68e5---38915797555.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8d626dba---53140735735.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/2da8e7edb9bcfd68ac6379cf212d5dce/wotuwato.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8c3d93e3b94e91ff40d77f9611b22477/siwikoj.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210704_104840.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8sho7ulp81stvo5c5n9mgg6pgt/62960216243.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/butob.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/mapijixumafakoxijejowe.pdfIn PDF document text
    • http://allycatering.com/userfiles/megagariwitefakudofipaxef.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/58420289747.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/94871539716.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a345cc484---63312502848.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/18026876611.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160981b106c413---pexoxuwoxalakow.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/wemanewu.pdfIn PDF document text
    • http://moristas.com/userfiles/files/mevinuji.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/55255740304.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bd7fc31---senubonosisemup.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b038074b5ac---wogamukasuder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=frp+bypass+apk+free+download+samsungPDF 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_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 17196 bytes
SHA-256: df6ae80eb736eb9bc523c98216d8422c7daed55f54c830e3ebe43fd5e75ed576
font_02_sfnt_off00013d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 11160 bytes
SHA-256: b8d5ed951909a12e1e4f855c558a25c67482fac8f428e4c811f7b1ddb166ab6d

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