Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a138f5208e93ad…

MALICIOUS

PDF

110.2 KB Created: 2021-07-23 17:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1eb54d48c1851be7dde774d9884b4b1c SHA-1: ec9b8719bce8ad90b308653bc3eae44c039b7233 SHA-256: 14a138f5208e93ad5b2212ae4fc3e602256683c29cf97391e6556c1084471114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6e562e0a6dfc7c78c2ada63c089cd6b/92834567031.pdf In PDF document text
    • http://goldmustang.ru/files/files/pirubul.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609125a0e26da---lakajetagotezilo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/n9huo8kov5sj89cni2ckpk3846/zelusakab.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/802b57a94073f6566c513f29b5fe6624/fedosagoxufavumigexep.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210709054521.pdfIn PDF document text
    • http://prograsifkalip.com/files/69088212662.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c422feff---48188983734.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/22145122301.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/34536284394.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a19942ec82c4d5301ee3da4d717521ac/zipoleb.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/kfn5825cua0584mjdl1ab03ei4/40251013462.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/kexedizeminasopujatukub.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/21655345423.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a286680b5---56341011341.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746220996fc---buvisik.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083db5b87bdb---17725998275.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/df0bbacde62abf1d89293057ad342ada/vemiteposuxap.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d4b49dddd3699da3c1d901bd38ce1455/sikotasutilusur.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gukedam.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4ifru9g4dk40naemei4usl6k05/xinuvubovuvise.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e15bdb120---xisifoberiwazemuneminova.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a31497ea---30782859578.pdfIn PDF document text
    • http://standdominica.org/files/files/762892700.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70330d2076---ximosataverati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=is+blast+protection+good+in+minecraftPDF 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_off00013c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 11052 bytes
SHA-256: 31e20d86c5d5a85d5bfc7374c9155496a15470fe8c70466433243c5a7ef790fb
font_01_sfnt_off000155a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A9 24116 bytes
SHA-256: d6a0d3c4a8b1ddb1da894c9ccb769eec1ca5c0e175843e2af310b5b9fef39029
font_02_sfnt_off000191dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1