Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8ef2ad9f240113…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 05:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7527a54c7db477f6dcd0da64ee958ff2 SHA-1: fd58d26cbfa79cbae47b046ac457a99375f90a96 SHA-256: 6a8ef2ad9f240113f575aff8839d4c3267cb9fff8f39f831a4f59a175baab836
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://bloomx.com/sites/all/sites/bloomx.com/files/9754440046.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e6975585---38180953426.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/97086825228.pdfIn PDF document text
    • https://proxus.nl/file/valubevatikijikoxariwiru.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/rorssrpvvpvv2jjkh3dcu2v3c9/2118408745.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160755e2722ee2---lajizinikixokudilupawivag.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/tabulonuf.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c55799086f261d86018699d05d77e45e/tuvebuledegu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/32117024315.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108161147289297.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7eea090a2---dipuj.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/depag.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc55b96c6f---23757296117.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/6304962062.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609631d399b59---6281460643.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ac55daef89096615ae9efed1c8a979d3/tonelarawasodufud.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3d720bff74a50d89f3fd7e4539491812/xular.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/46447925863.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/kumomubara.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/fidugesu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/42111647710.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/nokifetavulimirigusixizis.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/aab0a5d6237b16c23118cc8038d55f34/libofaguwuzimigigibuzuwi.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/79872202527.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/46aa746ce231a3bc48b4af86749b588d/vojamifofotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=different+types+of+transmitters+pdfPDF 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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 16472 bytes
SHA-256: cf9c1a4365fb03247f0e8ad713469065a2b95df3e84be7c6ecfb8751ca6cb404
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 10728 bytes
SHA-256: 93a7cf25f3e07b42c9da0fbccbecbdd418b878fbb0ec9b06bb98bf9d6c6387c4