Malicious PDF — malware analysis report

Static analysis result for SHA-256 30716032f5797be8…

MALICIOUS

PDF

78.1 KB Created: 2021-06-25 21:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c972a4f6d2f88c81421f00e162a45b41 SHA-1: 8867555baf3497ee2754024a65e693f3c3833ed6 SHA-256: 30716032f5797be870dc591d9a08524bc7194c45c99a39044ed5da78fa6d2b8a
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users, potentially to phishing sites or to download further malicious content. No scripts were extracted, but the high number of external links and the ML score suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://infrive.ru/uplcv?utm_term=multi+spindle+nut+runner+project+pdf
    • http://luxe-pools.fr/i/File/85342300118.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b1d106a1---gowawajugobisojotarab.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/makhjb84uhre5j6tj2d4h49596/dozusizetanigajaxubivepud.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098a213492db---70002401376.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/jeretufapevosazonurur.pdf
    • https://anthonygillant.com/userfiles/file/jononenosanobidevo.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4162e6e0e4---67668198419.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e221cac1---rumin.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1d40eb7157a8eb12b789f6d0a33a7765/xinupuwedinenepifoke.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/69090489428.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/7ovmn6tgb86112786gjppjem64/wadeluzu.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9cc234030---nujikimemakejanapajafu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a305f4864fb---81622927769.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160705c1cb9f2c---49233286742.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9b401c81---fabowurevukoregipuniwub.pdf
    • https://baptistfriends.org/media/43670503149.pdf
    • http://innotack.com/userfiles/files/17515826841.pdf
    • http://www.hmcpacking.com/uploads/files/tokupujapolumeru.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0559614de---24592233741.pdf
    • http://zulassungsservice4you.de/bilder/file/lorikiregojodoman.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed832008d7---sudog.pdf
    • http://tz5168.com/uploadfile/image/2021/05/28/file/20210528_072813_109.pdf
    • http://linkipt.com/_UploadEditor/files/ledusexas.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9ae83d4cc03eae02b2a5c4f83e00a4b8/vilofatidopeso.pdf
    • https://hpsoft.shop/upload/files/ladageguwafeg.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436f4032f5---xobivufatujadadokixej.pdf
    • https://schmitz.cz/res/file/11198774392.pdf
    • https://ludifrance.fr/userfiles/file/ratuguvakuru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee7.bin
2d6cff100b6a46051611593d781eed078cfefafc1ac430c6960d5536b94d6d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 10672 bytes
font_01_sfnt_off0000e76e.bin
5690b8fe8a1e1b2cb0b40eb2fc6208e81984064b65f0cc1761f3a47727a540ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 16640 bytes
font_02_sfnt_off000112a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 16792 bytes

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