Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9be5177f15aba42…

MALICIOUS

PDF

64.0 KB Created: 2021-05-31 23:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c629fdd567abcb4e72c0e2074f6153cb SHA-1: 56ea019f8e445a1d976aad2a518ec6da3cde3c3e SHA-256: b9be5177f15aba428e102c4f3b66491fd45f879e7e77e246ff0f0c1809d86f46
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce00dc7a4a---bafowovejugitilosegiso.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/j13gvjih5244ao3db645i1lhaa/pojotijoz.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5cf43a83efb4899aa044871e1dc11708/kusanotawivalifoluso.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba277ee29---61988727811.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f8237543---10330586818.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/24a324b75c1c540c8a2d8af2337b71c2/89601872082.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/26060609919.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f7f9cd5adc2cfa71f2b06a2a7fd8ef0e/gelawawa.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgrki5ov4783eb3ss9s26l86a9/77132227393.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4938a99b---wafuberovijiw.pdf
    • http://project-lovcen.me/userfiles/file/9181200701.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c07e1f6d39f522818fe29b41848a3f55/71092503908.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f05643a7---gujixevadun.pdf
    • http://aceonlinementors.com/userfiles/file/92100882411.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0e17ade8540f72f389d5b0f4a9560829/fefewugumezite.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c9be982c1b---tovatutamawefamapatenovaf.pdf
    • https://kovtec.pl/eurostyl/photos/file/lovuwizulalidomepabogeka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+a+good+birthday+text
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f072.bin
265d25c417bd06a7f8fe29bcee8b362eb7a4b88397d4c9f5f36f08b3f8d7aece		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 5376 bytes

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