Malicious PDF — malware analysis report

Static analysis result for SHA-256 a450c181eccabb00…

MALICIOUS

PDF

68.6 KB Created: 2021-09-20 01:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bce080bea260e17f9041fddd2ef0e006 SHA-1: 0ef577cd8643790e4f3336aef74259c48ee87458 SHA-256: a450c181eccabb007671349c0391736c71b2f4e95aa7ce07a735a19e3730c2b7
156 Risk Score

Malware Insights

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

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 PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. These links likely serve as lures to redirect users to malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cl-pub.com/files/files/26859220186.pdf In PDF document text
    • http://sudeoksa.net/userfiles/file/20210911070734.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/129b92e3dc9451579aae08cc80720e82/70688779499.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/6441866511.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd93166ed6---42156112054.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/81255356699.pdfIn PDF document text
    • https://2acontractor.it/images/file/62946396262.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/migitelotakix.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/novezilajuvu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/42259116863.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/14034997516.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/161400044807.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/35627730027.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9dc315f2---14919010725.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/mugerotetotozuv.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/jikataziguwaluxawivebek.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/62212584660.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/25636414502.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/mokaw.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210904105458.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aa4695263---wemuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=unturned+door+idPDF 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_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 15016 bytes
SHA-256: 6ca46d3dc5e5f3985ddd791c196ed59359f8994bc6d9738ef72f095bc5355b79
font_01_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 9972 bytes
SHA-256: 207df01b07cbf34b383429b55fa9a8a6a5805f5e41715d4a00dfe6ea95561b7f