Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cbe791ea4deca4…

MALICIOUS

PDF

59.9 KB Created: 2021-05-29 15:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 866995c67fb5c16ab5634a860bd0c4b7 SHA-1: d8bc5d7464390b682bc098d5d59e03d9b0724396 SHA-256: 45cbe791ea4deca4bccb690365d30a6012f537e97eeb8aaa5f8751b1a9127934
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though partially corrupted, contains a title that aligns with the link farm's theme, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=alain+soral+vers+la+f%25C3%25A9minisation+pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/03c98fb0092edc6b7249f87277b848c0/67240820711.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8ac8200eb8c2cbcb9769d4edd1b2bb05/3373693787.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3467d4be---lewuxowugodogonew.pdf
    • http://bjbtrh.com/files/pic/file/81286813901.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/99a3407753875f8c76a027b601f3be69/jirelapegatikom.pdf
    • http://www.bluewhaleline.com/image/upload/File/22422652006.pdf
    • http://amctop.com/board_data/editor_img/file/202105171057.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4279d899f5---rabiduvubilu.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ghi9racjpvqa67j2q8h4qubor4/lefib.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1otd67dr3b8977rmtf15mch1a6/31866278618.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0871ee460ba2b6fa3b589e9508eff38/dupisujowokabubasuzudaduf.pdf
    • https://ancoraeducacion.com/images/4315956364.pdf
    • https://aimhc.com/userfiles/file/xafamenimej.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3203c87a5---jijumenezafipar.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d7c70461---84112973019.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/966094f0e2f639395ff86d4718dbce6b/kemob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdf.bin
fb84c2a544b1783b6eca4c4c46d154554d97d0146e17614e3a6c7984395bc254		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 5380 bytes

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