Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd73185f0ea52865…

MALICIOUS

PDF

84.6 KB Created: 2021-08-11 16:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 082bcb5f2cd9be567961cf61c1fc5a7c SHA-1: 0a3285d057c74fcb60118954dc99ad083b0bf95f SHA-256: dd73185f0ea528657791686666c822d74876e5dda7e1e63ecb63e3282e66c5b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://millecolori.it/images/file/totanabaguxopevifarunap.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/71813876812.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc45455e1e---firujo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883d56a49---54616055818.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/clksfgglddpt24o0h95j19oahu/wabafikurifow.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad854c3df35---87582862375.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503025346373520.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6f76a150a11d02a80ad2d4ee853a41a0/7987901361.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/52f2go9hob48p8ilcjcvv9rhr5/39903312637.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f61c5f2385fb9aee5725f2a4f8e07458/86897179419.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-13/20210513002221621942.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/oj3a5sfn30kehuju2o2njm9mmt/tetukuv.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/61a322ba3fae15e4ea7c20dcc0aab7cf/32776821342.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/qgr5b03l5u53epop49g66puofg/zutomux.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f44103c8fe7---sumabonotozibetibewotot.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16101370ba9821---17797846300.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9a5f2602881d7da9952501672324f201/jurovegibexerem.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c52b395bc---65122349499.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/4707992300.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b62c7d29e122864e5dd716084d6b27ca/baxipovalilotukerepozug.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc6a09854f---27881952513.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/95319346390.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/82994011092.pdfIn PDF document text
    • http://elskenecologie.nl/files/tasofipugupigima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=las+apariencias+enga%C3%B1an+pelicula+completa+en+espa%C3%B1ol+latino+repelisPDF 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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 17228 bytes
SHA-256: 9a445ee9c836e211aed6080d08c167fc609bc9e502a92dabb26d8ced32b4086d
font_01_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 10980 bytes
SHA-256: c25b32a8de68fc8fda5a4be25dc534c063ed2c6727469d5481bee127ed7000b9
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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