Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed5adf65325491d…

MALICIOUS

PDF

87.2 KB Created: 2021-08-13 10:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d84a05505d9657104841f47c4366f84 SHA-1: 69281364e573f82213726381dd43215a267aab84 SHA-256: 7ed5adf65325491da4f9700f8d4be1b0e72d5e8fbe41ee352055dda85677685b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into phishing pages or download further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results for increased visibility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4ae5b68566bbebdc4cf8899014d7f281/wivizonujupokeruterufalex.pdf In PDF document text
    • http://lhs1965.com/clients/880801/File/tabumafexijatazubud.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/34962890046.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842f98d324d---dagararuxidoguto.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/wefadomijusofoladi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bd94bc9df1d56d999927fff81e52f82a/40800595942.pdfIn PDF document text
    • https://bem-sa.com/img/file/dedapaderat.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d376250016---jiwigupiwobiledizoliv.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/45039508208.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4a9d4fbfb---bovapi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2651ecf2a5---zimuxubimimowojuxup.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8itrbkrr9tj67cjc9a88r2vkuu/83800525208.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/51j41isf5cbjlclhf48j1kdras/sivuviletogutobu.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/fuwixofemasanuli.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/19630579968.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cf9e16e5810f9b840efcf77626a5608c/muluwuj.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kvq2e559k6gsd9ida65amedba1/11980232772.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/3856619694.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/54742314736.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/nukop.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wevajipinoxifevegafelat.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/64aga5rqg8pk69etbuekkrmkn1/favajimur.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/zexasorotoretop.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070118b2d02f---dalovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=convertir+un+archivo+pdf+a+excel+en+linea+gratisPDF 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_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 18068 bytes
SHA-256: be7088a3b2b7d351d0a011109ca7a6b0b56b49ef3b8a7f01b7f1249136ef2be7
font_02_sfnt_off000133b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B0 11196 bytes
SHA-256: d7d5da5f5dc7cfac41584148f8037e63b68da4c633e0b005c0741584d9f2fe55