Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b522bdb90138a45…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 07:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98d3865a5ec40184fc103edd4dea3737 SHA-1: a0bb87e81cdcf8e1d5b23efe4c572736f4b2ad42 SHA-256: 9b522bdb90138a456625e90791058f01b97d63051e1dbc163dc1c26a81b81484
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users. The primary goal appears to be directing users through a chain of links, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 https://menu2uplus.com/images/file/liparomumofoxixevovusuto.pdf In PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/65169878301.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/tiwaguperezefo.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094146c6f2df---suvavokid.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/29d23ba5b0f0dde69cafdd06066706e0/lotopixerofam.pdfIn PDF document text
    • https://goldenapp.net/file/26782474264.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c6638153---kekovopojujaxumimalutibu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/an9a9ntt0nehtiuif04ko8hi71/kisebokeni.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/zapilikege.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/26935405512.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/36327574619.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9677ec91---gaketarekamixepikur.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dle1rnupfihq7ha4tn56k95jfg/ponova.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/94448996311.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/26064634341.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/95241919254.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f4edfc71585a69df63f21b395e2a815d/57860467871.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/tilazunupigomoz.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1u1hc3uhevpeu2u7nqmslva9h7/15475089371.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed343c4f59---52518672483.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b9ca8af2d---41360144092.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/vemixux.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106271102.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b1e28b39855dd8b4ca4519926b0d2a38/96854324891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=signs+of+overfeeding+breastfed+babyPDF 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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 10876 bytes
SHA-256: ccb33b6a4c4cce5d7a2c3083d4f8bcc5efb29a0bfb3e08fe5f863f0c96f26340
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 16356 bytes
SHA-256: 86d21ada70719643e6a7add16c5d1aa5c74b29935633016e1e331f8d294842f3
font_02_sfnt_off00012d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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