Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb7984786102ef8…

MALICIOUS

PDF

154.0 KB Created: 2021-09-05 18:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69506ac7fc89ec20ce230ae80c5a6865 SHA-1: 5e32fda3270f683725a8b87d8f45efc5d4f04da9 SHA-256: abb7984786102ef80a560123b8bb7eb7a5a8cbf0ea56c69978f7f7e12522c504
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier strongly indicates maliciousness, suggesting the PDF is designed to exploit vulnerabilities or redirect users to malicious sites. The presence of embedded JavaScript points to an attempt to execute code, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=learners+with+special+education+needs+pdf PDF link annotation
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vapedujuxomaminiworajoge.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e22f6c0d9f3---63295516536.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074150fbdb2a---90786535177.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/77740151015.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/katirexikakixu.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/povetanubatifasun.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae56e8cfa---fepaladelonurovijor.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gawasakanororomonozexe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42580d16639e95661f9c0895eec243ad/30421078085.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8aca28f1---26156566682.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/1774938106.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/33265521109.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/govirewesitonenezokit.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/np0ddlrjvqdnt1on3jiu9bdhin/67180861729.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/75331306d3d254d705e6695b0d23d901/jabovewadolozapuno.pdfIn PDF document text
    • http://mariancozma.com/_user/file/97482779895.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b3f31b5d93ca379003af2e5f80bda217/29269425659.pdfIn PDF document text
    • http://strandedtattoo.net/file/bobedizevivanonevij.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/cb6d9f82946b61db3dd1355c1de09f99/wagokitosukujaz.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92560162816.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f8971264---lezir.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/kijaxinelojuwup.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6ab04b37---68719607870.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/ralutuzivazije.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/41088422436.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_off0001f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B80 20600 bytes
SHA-256: 46c156d62acf22177c88242471419c64642fe298be1d4390b13f30362cfc816d
font_02_sfnt_off000240df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240DF 10860 bytes
SHA-256: 0d5f481e6d82d52251b8347c3ee8378496901ed26c732ad1c38e2b019e24127d

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