Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3eed080a666e6c…

MALICIOUS

PDF

99.0 KB Created: 2021-09-08 10:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ba9c490ca81e374f84a79cbe77f222a SHA-1: 38c0b0dd38658b96205e4400eece9004338ed237 SHA-256: fc3eed080a666e6c681e2378c19c034d6db52b1ee53460c321581c51948c937d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://eggtesting.com/admin/uploads/file/xapupivizesenawi.pdf In PDF document text
    • https://lee-trading.tw/archive/upload/files/jafujoko.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/gabafuradafolavexiwafol.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/49996052259.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8b00e5d0---develobomalaxuvexise.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/24570491759.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ab2d75ab82dc0427678b23b62630f7c8/rifig.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/66619445584.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c926189956b---44374168109.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/21985069466.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/rerejutogedatapew.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/govepojetepurazabenuno.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/77999317339.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/76386599865.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/zenatoritodubodupodo.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/51881523592.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/93345647.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/bofekodaletudove.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d5929dc32bacfff0dd506ee51e95a52f/13743319922.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/69679488054.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/57269326698.pdfIn PDF document text
    • http://russia-ex.com/72403447651.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/52611970541.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/65688411206.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/030dd139df5fd8549c6f1cee753b77b9/kuzebipepazumipaxu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a52e47108---1412344032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=capacitor+number+code+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_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 18696 bytes
SHA-256: abd133cc9db2e7c54c74300cf50acb6384b024af332502cca610dc7ac9c5b0ce
font_01_sfnt_off00014d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16596 10836 bytes
SHA-256: 7ef0086638f298452d082a994889eed0536aab6d4629a8dd4bbc8d90ba034bdb

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