Malicious PDF — malware analysis report

Static analysis result for SHA-256 1902f4e3efb05d64…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 01:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d109f7d4fabcb216e7c34d6cb10d9e1b SHA-1: 8208bfdf25b308a94896f46e488a45ddd3e52ba9 SHA-256: 1902f4e3efb05d64ee67beea7bb370dc142e1c7841bb5d59e42fea123fb8c230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the link farm indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=marvel+5v5+moba+download PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/91881cb97b536fb24c8e069fcc07a025/39469579627.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/xevisabotovotojofo.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/86128264564.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc424293f---janame.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/82771299595.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/xezemilusaxufenadotem.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/30c38e9a7f647737b4e5cc5258c6cbe2/selugulox.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/segujofafug.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/najodezez.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/48879036128.pdfIn PDF document text
    • http://sro52.ru/uploads/files/8312506264.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/tamumi.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/69669538794.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f5132ab8---45323098458.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/20633162816.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/6561869309.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/mibezemixanalupugezizexar.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/nuwesawagigikebed.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/lapofuzet.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/vavimamudeziwodekatutuvep.pdfIn PDF document text
    • http://tabletopad.com/images/file/raxatijagajunanaxixonelej.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/tumorivevosuranavim.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ef535e49---jugowoj.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/gigibopipejako.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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 10468 bytes
SHA-256: e24590d078debeba0bdc9be4fabf9b872a655e5ae3d135df6ff457fa7de6f6cf
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 17224 bytes
SHA-256: 7b9865e9d4c99bb1a5c4617212042e3ddb9e631f239ebc0d0f0e1e8e95a6bf9c
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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