Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18fd4a8c2e069da…

MALICIOUS

PDF

84.8 KB Created: 2021-07-14 01:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 884276c04bb1b5dc54094f032a362c3a SHA-1: 05ee1e432339223287cf9ea93e71a746303547d2 SHA-256: a18fd4a8c2e069da8366117679d5a1cda80f331f1b37f62c83b63132b5057a1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of external links, many of which point to compromised WordPress upload directories and other disposable hosting. This structure is characteristic of a link farm designed to obscure the ultimate destination, which is likely malicious, such as a phishing page or a download server for further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://universal4shipping.net/userfiles/file/54806310010.pdf In PDF document text
    • http://hodinovysoused.cz/upload/file/jerikamilirulanefi.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/xaxifevepimuwudoge.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/26015753099.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/53ffaf304df3e0aac65c24cdf4c8df15/gebuxijugudenopet.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/sl60gqd4vtdioksrkkat5fogqp/zujikorokupidinavevop.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a295d914e---26581610483.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083afd41131d---zobewuvamopotawuka.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0mqts1g2br8pv22chqo98ug2s1/66819961894.pdfIn PDF document text
    • http://mosjob.ru/images/file/rabujevura.pdfIn PDF document text
    • https://windsbs.biz/files/file/rabowisiko.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/69j8cdcl8s9pkk5bloke1rqmse/93005151338.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a365cbe43c32ef0714411f04050f512a/sekulexifejitun.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/8827658565.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/vitomowibegafufaradufeb.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/eb16c5f43884a8ae5b69a92b028d7c7f/93363247486.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b864b76d5---15681950863.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7db2d3237e77ac251b199eecc426266e/doterob.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jefuvi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/wikekekidapisadi.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/viloga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=12+history+new+book+in+tamil+volume+2PDF 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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 11044 bytes
SHA-256: 8964d3d24051e08da84dabd2d1a19fc62da8d03d80cabd15a8d5886757828b57
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 16696 bytes
SHA-256: 1bea8212f6b7c0f6fefad412ef6eb942282c19200b7a5650cbcf4168a4f1325a

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