Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3831bc0e0ef22d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 10:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52981ad42248eb02db4ddacd4330238b SHA-1: 9f4b3eb7829fe7bf1cb8eea76da8317954c2bb4d SHA-256: af3831bc0e0ef22d82c1cce0c0c4eb19cc0a4ae5ff582dceb16e6eafc3cdb916
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's part of a link farm designed to distribute traffic. While no scripts were extracted, the nature of the URLs and the ML detection point towards a malicious intent, likely to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://peaceinsrilanka.lk/userfiles/file/12051322252.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f72a99a423f66955e61f3542b0080e2d/xavapaviwokef.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/nejuwiwonodarib.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/biketomanes.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fadd56a16d---33768745267.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/natokirezadevijojamaf.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/pukudejikabexikisux.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/zegofik.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/jexiboxaziw.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/53627411092.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f8c03cdaf7b9941dc463780da8bb2db9/nabasubodopetuxaja.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/44678010880.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/66784441648.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906223325971286.pdfIn PDF document text
    • http://allasclub.com/campannas/file/6202221816.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fowuvinojavamo.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/degekipuzil.pdfIn PDF document text
    • https://theipbuzz.com/images/file/8962510946.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/vazajiramiwujotaxonazegej.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/36814433992.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/xesususumomurakigu.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/56641936378.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/sefowewe.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/biwegusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=come+registrare+chiamata+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/23434205518.pdfIn PDF document text
    • 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_off0000be0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 18240 bytes
SHA-256: 3a4287efee49cdc28e646e954754cd1bc9e90e93a41e1a27e9c16d71264dc446
font_02_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 10804 bytes
SHA-256: 0983ce42cd606efc8454721940e5e6bf44c16c365184d16375e48e1f3b16e7dc

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