Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50aa014fd05976a…

MALICIOUS

PDF

74.9 KB Created: 2021-07-01 14:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ff7e3989dd5dcff17d64ca595e7d5ebe SHA-1: 52b5710bfd0b7eb1c2f4e73b6b4fe8a7341f3380 SHA-256: c50aa014fd05976a52c67c9e039aafebeabca57e3a5895244f3833cd58df99ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the final destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage SEO and compromised sites for distribution.

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 http://knshzj.com/CKEdit/upload/files/99512446406.pdf In PDF document text
    • http://nutrisoilvietnam.com/upload/files/77846060108.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/wovil.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/romuvekatid.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7565ba4a43---dujugamopoxapomewe.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/7858d65efb44a712b422e40ded7d693b/74213235565.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a189a15cd49---mukaxoneruvozirazorix.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sisawiforesibojulijinukuk.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/ramubabelupamizasu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609897d4aeea2---mideduwosijukof.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/191fe99caf739fe2ee4f6fa372b98c7b/mevova.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ef3b1dfb75134c57cfc901ded751b15b/poroworunumiko.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fefaf0a8c6---74085479345.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/450hd4b0ua850vn4pfse2altq2/vekasigopiw.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5300c0887---samevegufazupufoverarojab.pdfIn PDF document text
    • https://ahha.az/userfiles/file/42326972413.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/zejojidefajajerope.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c2262581adad694802ade2ddd7c8644a/61341740123.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/modikatuwedogojunofi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210522234213_75830850.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tf7m9019r38vlch7ch6nhnrs5/53152093517.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0e88912f---90966178615.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765a4b0bf87---52479488574.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/28302423563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=find+perimeter+of+rectangle+whose+length+is+40+cm+and+diagonal+is+41+cmPDF 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_off0000c00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 11380 bytes
SHA-256: 2e653010e3767c561ea0ba83789e8d8e096ca2b5471089a6c00d5928d8672ac2
font_02_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 16560 bytes
SHA-256: 32f331186b50162abb183baa67f26f9d29810aacdcb83c350d1229ca1986c77a

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