Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04cc4f6d4b876c9…

MALICIOUS

PDF

70.8 KB Created: 2021-05-30 01:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34cd6a50ce733280b8cd4bd9a868a818 SHA-1: 7a0ccef4cf0229945a87fd049036f21958cb1aaf SHA-256: b04cc4f6d4b876c9604b3e996fe1efc79e137ccc4b1fe9ff77b3745480c33098
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gamasteel.net/userfiles/file/lufane.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace8d4f720---45138956937.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/738b74053de9da26aec3cf285b100975/61561118035.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f87d28e1---93333412882.pdf
    • http://yangpupark.com/uploadfile/files/30544120803.pdf
    • https://batikatravels.com/userfiles/file/vovikivapatiwu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0aeff9730246bcb8c097b92b20b1fb6b/pamubisuwas.pdf
    • http://barcabianca.eu/upload/file/kegub.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4a4bd2d8---vexapugidugadiduwupawidi.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/29f29d4c34431bc8e1a630a0c0c30fbb/laxarosovutedijozan.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8b663c4f---22265948004.pdf
    • http://nacyc.jp/Upload/file/34073762688.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/rn66pdoo232qrg61jq7d3a75b6/72981283224.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda506a902---30335861714.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5223jll5nrep1c2sirpiiser3l/loxujimugirevadopipu.pdf
    • http://szentimresiklos.hu/upload/file/35558711193.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=install+apple+carplay+mazda+cx+5+2014
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de00.bin
a7a17ae62b28ab946a8c0d861ef666e849b1de87a93ac981f06880b4cf433feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 5916 bytes
font_01_sfnt_off0000f232.bin
5dc58a18199ea183c6d970fcad05e9f8a8f31a5ff8094ca508cc7b24c5d45f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 10904 bytes

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