Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27c1fc0145bc9de…

MALICIOUS

PDF

78.8 KB Created: 2021-06-29 06:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1bb859bebbe39f474133fb898815cb2e SHA-1: 419abc1d7a7c417b0b29efe8e784944eb6b65aa7 SHA-256: e27c1fc0145bc9de479497b424b033a87b1b3a49521f116a01a3419412968515
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress upload storage locations. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially malicious content hosted on these compromised sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/id25k8uutcrkvv393dq4l6ol19/lifepofetobozikemedefujod.pdf In PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c25146d088bacc42c47600dba4b1e59c/72444077058.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/37715157553.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b872c8f3c---42723014938.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d001c1d887a---69603915769.pdfIn PDF document text
    • https://activepymes.com/pub/file/rolebatedipekegaku.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/07d28ac42b7f9f67c7e75e611df0cda1/88641742229.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/wiwoderugoregazol.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a638d160---rovogikilodojifotepokisak.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/jonegevopexarudowiwu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/41aaf3da90585a6b53cb58ad0b83c69f/78096353265.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64877a8f5b---92806246111.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wodazimiwarepiwekobov.pdfIn PDF document text
    • https://asiabiru.com/contents//files/68061713224.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae65883242c---powabizafuxazuki.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc187cad68---naraso.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/sezaxikazud.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e5357b29142d94253dbd987108c5909f/seneka.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dcf0a1ebb---17491339296.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/69013313948.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b033a892bee---28512731792.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077473d85778---zomit.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3fe44e13b---mulorilenenawovenufesuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+hobbit+an+unexpected+journey+extended+edition+subtitles+downloadPDF 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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 17500 bytes
SHA-256: 9fcf4c402c10930361bcbb0deb3c2704106f8fe5ae5ced783357aa8a073bfe89
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 11248 bytes
SHA-256: 260892908a170202c1599a93d1ec98392fcab72df959a9730683c08e495f12b2
font_02_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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