Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75ba0922a198f8e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c114136f71b3e810fb256fb21fcff83 SHA-1: b7ce25723a446d04e66432851acc3dfb018373d6 SHA-256: e75ba0922a198f8eaed77433ad076af1d68c585bddfb3c0d47ee78b2845cc372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://benthanhsgfarm.com/images/uploads/files/pasebikevulo.pdf In PDF document text
    • http://pierrevillers.fr/mairie_files/file/tokoxiwiv.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/nafenezopo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e767330e---mekezexonesujinubavopewe.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/40979832521.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/keturitufedorirupixibu.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/13918815587.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lisagibutedat.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/762a699cae4f280837714b73959df567/77467365863.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/37445021679.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/kijukadujumelulome.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c80b0572---9269278488.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/96831846042.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zifoguzijijerowugu.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/gojunugefejafavapivow.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/bevimutekazup.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210922172850.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/wimatasoxaferijofegijume.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/tiserosipu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb8130e03---7500728324.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161487b77d20ff---20157900686.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/71006153555.pdfIn PDF document text
    • https://olterus.net/contents/files/9902568763.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/sufolidusu.pdfIn PDF document text
    • http://parateam.cz/file/worozakogosusudude.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/sedabusudef.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/19203483123.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6d6af974---62460781322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=transfer+photos+from+my+android+phone+to+computerPDF 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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 17380 bytes
SHA-256: 77d183004d554209df7eeb582d3e996cb87677979cd160b7497e55010679224c
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 11016 bytes
SHA-256: 4a20288cc5fafa4474d0eba5a8db89f9952207cd59484a3df8848d20e33e240f
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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