Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cb6bb13ae99c26…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 01:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c68f8865acbb830d4b457704642fdaf9 SHA-1: f3f32295455660cc978ed0e99f2be8a49c0afd13 SHA-256: e9cb6bb13ae99c269f6a37f4cb646a8c7b94c073809014d8139643d8d1ead625
96 Risk Score

Malware Insights

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

The PDF was identified as malicious by an ML classifier and contains numerous links to compromised WordPress sites. These links likely serve as a link farm to distribute further malicious content or redirect users to phishing sites. The document's structure and the nature of the URLs suggest a tactic to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/57559da6fefbaecc0d8ae6894fbdbf61/dumexoj.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d2a66996---rojuw.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be859f070d5---fuzinasu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1794c2f1f---vodatojufibowu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c10b34cad---33079321831.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6886fb436b79434089fbfb1374c9aa0/20198599591.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b0dcf0d3---48664750870.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/31245609042.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/fasudamoku.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258c50173f---gazawilanometa.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8af29cb40ec914b02bd7d1e759c78adc/57195067291.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/lilomomavix.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/lewabusalumineguj.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d975b529---kofidoxakoweja.pdfIn PDF document text
    • http://fullx.net/files/finasazetowevuniloxe.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24b7e7264a---bupatinujukope.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hf211es5l5pf2slmj76jqj12rf/mogumazupumi.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bd507321efd---26166606143.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6cc426355c56b284cbdab23df04cb24a/91818110650.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081fdccd2bbd---97683165047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=step+ups+barbellPDF 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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10244 bytes
SHA-256: d897b7cf3e20c47b7f4a48652d6c1c535cc78eb7b1fbecec4374f2647a3223f9
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 17440 bytes
SHA-256: cbeb7d6e164f4cef2397a7c0dc485c0dcf070285d03ae5d6639de10a2a876cde
font_02_sfnt_off0001319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.