Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03bd41d8e7679cc…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 06:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b86d02a777c32fdc12fdec375a1d9146 SHA-1: 6fd0a7e3177769c2a5342b9d85818a89bc69bd66 SHA-256: c03bd41d8e7679cc84c65d05c58ad54ed5589fedd0e8bdf9ac31231c84dc2dd9
64 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This behavior is characteristic of a link farm, likely used for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 4

  • 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
  • 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://krisoc.ru/uplcv?utm_term=chemistry+9th+class+book+in+urdu+pdf PDF link annotation
    • http://firmen-bekleidung.at/userfiles/file/zurobidumagaz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4317a76a4---52495308203.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/998e32013504dbb784f3fd2cce592ca1/govixukarufirasug.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jidofuwakirovigezuwon.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/70249161146.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6d76641c814978f784d7e6004afd52f6/35867525860.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/mekodafinifanorek.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/61792483932.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeab7e86857---3073968750.pdfIn PDF document text
    • http://ibb-online.ru/f/file/50492827174.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/poxamatex.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/m1jkudaoks4i1mkaou1ndttqnk/77110852484.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/97190842569.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4818dc232b---77539637293.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/tizubexenoforigepopuk.pdfIn PDF document text
    • http://dd-eng.com/files/files/xikikimipikunovegugi.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/3385130219.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/h2llin7aj8v91759aom2ifefnc/waratabozu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/zilitixamepupamalebalavow.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737e9db7d47---50383093525.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da45123543---xiwaxedusab.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/wuginojiduxeb.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aea023c3e21---98624775428.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/7165154153.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 18356 bytes
SHA-256: e18675da55b23dd3a079e3f509a2ef2d160617f75a8282be72957049742facda
font_01_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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