Malicious PDF — malware analysis report

Static analysis result for SHA-256 e314eaef0a08d514…

MALICIOUS

PDF

69.3 KB Created: 2021-09-02 17:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9faddd2778dcde81c8d37e3b4bd2ac63 SHA-1: 2c7a6b1e6b61f43414cab2d10564b7fb1638eab7 SHA-256: e314eaef0a08d51442464e1ac8e291275aab6242eb671bda4cc8185893699523
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, several of which are associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://thebankcardservices.com/uploads/files/nutixega.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8e54a9b6---girilami.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210624_184230.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/rizifew.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861fb713f68---84973196452.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/98399162584.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/90l4cjs6us0416amjkltao9oj3/43853210085.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wivaj.pdfIn PDF document text
    • http://holzweiss.at/83497430611.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/89334197003.pdfIn PDF document text
    • http://schokobrunnen.com/idata/kuxawamorewogolodosuj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vuwuduvuzusukekalu.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/wideviwinijurumesobi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/g74knbjclh3qgevbsk30493760/27153634552.pdfIn PDF document text
    • http://oodow.cn/upload/file/210708021912653111tg7imx14wkg2.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9a87889f8ee6d029b5e0bb91fbd3699b/ginejefesegupexipane.pdfIn PDF document text
    • https://mauspro.net/upload/files/49654956140.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a381137f262---dojepafikemutulu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f7107a6ba7f587e6720d8a2bde52cdeb/73406196831.pdfIn PDF document text
    • http://ecole.ru/text/images/file/kusapegigikoloban.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/69604198002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=diagramas+de+flujo+pdf+ejercicios+resueltosPDF 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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 11088 bytes
SHA-256: 7f5b4ff575f115036345575fde102adc5aa774fae43459ddc2468b9c4f013d75
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 14600 bytes
SHA-256: 9609789f06dab09bc93af1f9e22f3b093697654b625c13b396f52a75c97bd1e6
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1