Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8ee81380c5e81b…

MALICIOUS

PDF

107.3 KB Created: 2021-08-18 11:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 426a46730f3a90f52c65bc53eb3338b6 SHA-1: 60b83d5a5521a5a4edded4d81556c564069d63f4 SHA-256: 7a8ee81380c5e81ba33595329b5f384db60cd5cd96f52305529ecff028f1d42e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of multiple external URIs and a link farm structure strongly supports its role in a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://okazdedziecko.pl/_files/Media/file/73632864538.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nrsdqgtfojgvg6v7f9rim3q4fd/92530966636.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/43968468181.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/zodaxowipo.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/17297893300.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/vudimos.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f0a6a943---400535097.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4dc36d2de8e408c9338c261ee8171967/70910864229.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/alfgsq3nkjkeaiph9sbufe4ltt/28936997673.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba7442a42---31194749205.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/96471547184.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662ff8effd---pelabeva.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7ea844c485df21b3cff0ff9c576a83e3/31946995303.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/lesegomu.pdfIn PDF document text
    • https://micsys.in/userfiles/file/80301681087.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kavizixu.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/88017716448.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/18b23fb02570da14a23a55d089ed7d49/fusuzo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e285caf90e2f96492dea216c59a21d14/jafijirazokegejelusega.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/19913698482.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/gazifugiwitusagapepeven.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/78935264477.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/3105276330.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c048144b546---bumef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=examen+de+espa%C3%B1ol+tercer+grado+secundaria+segundo+bimestrePDF 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_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 19384 bytes
SHA-256: 3e911fb25ff28d37720f21be6fc54e3a795456137afb9cf8db66febd14e1cfc0
font_01_sfnt_off000168d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D6 11388 bytes
SHA-256: 95cd9544f60ed54e4d01bb8e67393cc7adba8bdbcabccb569c7e2d22558a641a
font_02_sfnt_off000182f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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