Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b0543bd5d51b18…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 12:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eacdcada7eca0777ad42b4544404b9c4 SHA-1: 9717632c8652c1c623cff4a3477b478c8d29cdd2 SHA-256: c1b0543bd5d51b18f3e99333a98f5b7e12ff306f8d3046f616f4f43135a4bef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. This suggests a phishing or SEO manipulation campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://best-label.com/upload/files/putofefasodokutawenuje.pdf
    • http://www.tobywells.org/media/fckdir/file/71804245267.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacbf7cbb2---dotarexupirufulibilulov.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89abd7782d---toneluxujadisewat.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/be3ca7752a7fbd79309d1526713a7a9d/navuramotagivoviwigaz.pdf
    • http://kristenpell.com/userfiles/files/59789987087.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/732565df650bbb1957422d3192c014e3/35370385227.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1fc2eef0e---zuwobowixiw.pdf
    • http://alexlunacoach.com/img/editor/file/witulawomawufaludiputefun.pdf
    • http://www.proyecpapel.es/ckfinder/userfiles/files/65010978597.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daad280f99---77342560681.pdf
    • https://aymsoft.us/aym_image/files/fuxolewebedisonodu.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nkmevcjq7rurn92tgbaunl7ij2/pitepusefidekuwi.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd78a327d9---nazepubefol.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d6136f0d22f7713fbfd654b1d2118a84/36198070937.pdf
    • http://bandenplaats.nl/cmsimages/file/63962850758.pdf
    • http://bixenony.com/userfiles/files/56574346376.pdf
    • https://infrastone.com/userfiles/files/78445605367.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf908889228---poluvebetedigasemikuz.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5890b6c41cacd09af918454963529ac7/xeditijadiwog.pdf
    • http://akcjonariusz.com/UserFiles/file/tasolojopow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=simultaneous+equation+solver+elimination+method
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16792 bytes
font_01_sfnt_off000108cc.bin
a95353727429b4e1958906b3013bd7c752cfb2d3d90790538d5da5580a8e52f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 17604 bytes
font_02_sfnt_off000136f2.bin
a049bc33da1f519918fa158632a83303a3f39d967a3bd1500ccf712eadf8a45b
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 10900 bytes