Malicious PDF — malware analysis report

Static analysis result for SHA-256 5040641fa4cca901…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 08:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 608378890059774f0d75057464a16ef3 SHA-1: d74ef5427df522b2e656346ba139b8070c518879 SHA-256: 5040641fa4cca901e3dba93fab3ce2ff34b3e86d1b12da1493dbf6f8405ffbed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=delete+apps+on+firestick PDF link annotation
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/92680355698.pdfIn PDF document text
    • http://sinners-party.de/media/file/levetubowivuxuk.pdfIn PDF document text
    • https://partnermind.cz/images/files/23248404127.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1d64b0173---76373187048.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/2059362104.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7012e64fdb402a513657c64aeefb166b/47460021676.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/lususukelosebip.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/murovujunobevemaditigin.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210901232852_ldvb8p.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/72473295352.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/55872360485.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l1qks653s00eddp7e1muok5r73/17822006353.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/muvibunat.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454ef91b928---xobemokuxotodeneb.pdfIn PDF document text
    • http://agilesolutions.in/uploads/fifonuxovodumimosivifon.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/69528562638.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/56583587966.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149664206083---68798506422.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/71145105060.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20d3a9562---34179141269.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/96002674873.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/25192136995.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/daluda.pdfIn PDF document text
    • https://majubesar.net/contents/files/nenejisal.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/todalarojusegagujuxupa.pdfIn PDF document text
    • 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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 17792 bytes
SHA-256: 0bcc61460513303f7db29d91d832823d475c83b74129bea6ee662d4389f8fed6
font_01_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 10568 bytes
SHA-256: 5e2af2c383203324bb327236150fbdbbe583b05a926d59b7cfb51322636365c7

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