Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a198e6b059ccd1a…

MALICIOUS

PDF

77.5 KB Created: 2021-08-11 02:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f4b96988d33745adc472e20e187bf7e SHA-1: 2ab6e5979a07bd2cd8dcb96b15ff9422dcc2f110 SHA-256: 4a198e6b059ccd1a0a3e57d8f45dbb55f22a0af7cc6f2c3d5ac97ea4ad8e8350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of embedded URLs further supports the intent to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://inwebjor.ru/uplcv?utm_term=ninne+chudanu+pommantu+mp3+song+download+naa+songs PDF link annotation
    • http://allnatureint.com/userfiles/file/tuzibevupobo.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210726_011440.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/6765017209.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8bc3c728e4d12096768ab160dddb9a40/18451246164.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3112242505---99354066392.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062408584573499.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fdebc4dbda9---831143352.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/pokezemuzibufeximolum.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160865412ee849---lomozibinufezubukosukowem.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/18619067521.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb1425c3e---84944705613.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/peganilexuzesavopixixurow.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/45857043058.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ra7g07ugbdgp8m4198s88huhog/51991701145.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/fopulazofepetiposiv.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee18b9c0784---zaguluferimoju.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a0ea9338---mavit.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/jawagewox.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/gebupaviv.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/benob.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cdd0f1a72f93091450b2b6862bf5ecc1/48540017519.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/53809639400.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/komomureguxatudejavixo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB779 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 15812 bytes
SHA-256: 84e18c43cc19f0c63bd1fde740b211e8e763a800a5b00e202eb5cdc110c39853
font_02_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 11196 bytes
SHA-256: 5ad9f6944dff1d534faeb3edf4f1956a20da3237b2b729748abe7e0e94c2068d
font_03_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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