Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fa0442a2bcc096…

MALICIOUS

PDF

81.8 KB Created: 2021-06-01 16:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d45af9f71b6633908fbfb9e5696b790 SHA-1: 611028f2dfa4c0e997bfdbdf2598a2008d209927 SHA-256: b1fa0442a2bcc096c981adb13b4b83e876aa3ad55782d4e24d02e25b551de45b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9293

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://nomylo.ru/uplcv?utm_term=manual+de+calderer%25C3%25ADa+pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b063b29dc02---koxuxevowi.pdf
    • http://yilip.net/userData/board/file/zosamebemasoxidadumo.pdf
    • http://meble-tk.pl/userfiles/file/pukukipijuve.pdf
    • http://geometrabottero.it/userfiles/files/47274394898.pdf
    • https://vildmarksjagt.dk/userfiles/file/xokefibizaborara.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hkgquooglrrl9k51k8ri5t0l0i/58398818809.pdf
    • http://ligneus.hu/upload/file/manejasa.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa27e1246---jakilewexotu.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607201ff5aff5---48621165217.pdf
    • https://contabil-fiscal.ro/mm/file/81154984265.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c3c44205af88b1447aab3282b993fe0a/54586814179.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91713f169---dizipetivebilidutavojafuz.pdf
    • http://ahxxzx.com/userfiles/202105/file/ripado.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/22255351739.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a757449787---41687068930.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd74bc87fe---gaxanukaf.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9ef17fd9389054f281a48ecc066154df/89398058917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010293.bin
22d1e53b1c9f2b96d9df011f2e582f35c19ac1476fb64a6fbfa3fca64dca6c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 5032 bytes
font_01_sfnt_off000113cd.bin
d2cd98eda3bb301c349f83497b116709750aa4c373c9bd198ee53ee8aab646d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 1936 bytes
font_02_sfnt_off00011d0f.bin
ef28b0e92bd42a5f4aade7f3fe986dc4222911f2c6f1bc4cd17af0e4e4d85383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 12572 bytes

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