PDF malware analysis — malicious · c28e8d8b3e48fd62

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 06:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e320df53727a9c3322bbe5b525a9eb82 SHA-1: 31aafba2403f26ba241057d3e5da27ccc91a6457 SHA-256: c28e8d8b3e48fd62a1966257b38ef0f111d3fdc164f9ec9ec7e41e6badf0e34f

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

Nyx PDF Classifier suspicious score 0.4229

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://lokalsport.no/userfiles/file/54813245434.pdf In PDF document text
- http://www.hgekc.com/media/userfiles/file/sonibidugo.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138424cb4a29---92789088692.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d461655016---butesumu.pdfIn PDF document text
- http://shengnabei.com/uploadfile/file///2021090106043073.pdfIn PDF document text
- http://manchetenewsms.com.br/ckfinder/userfiles/files/sawatamidotalujojozujo.pdfIn PDF document text
- http://sobinco.cz/ckfinder/userfiles/files/puzovivupixojalisefekap.pdfIn PDF document text
- http://rdmsrl.it/userfiles/files/55386454453.pdfIn PDF document text
- http://cafemsoffice.com/userfiles/files/pupalukewusogozepidule.pdfIn PDF document text
- http://fourfoods.com/images/files/82551652078.pdfIn PDF document text
- https://calson.garment-pro.com/ckfinder/userfiles/files/ripawuletozolapupufosufe.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b3ecf184---3531554474.pdfIn PDF document text
- http://tehnicgaz.eu/files/file/3005274636.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1dca709d---bodazekagavebazaduxani.pdfIn PDF document text
- http://nanouklid.cz/upload/file/89371006697.pdfIn PDF document text
- https://hanyauntuktesting.com/contents/files/51865517443.pdfIn PDF document text
- http://bamboomfi.com/htdocs/cljr/data/files/73687444946.pdfIn PDF document text
- http://ahjygjg.com/upload_fck/file/2021-9-4/20210904213341378420.pdfIn PDF document text
- https://fong-cai.com/upload/files/migudixijakusa.pdfIn PDF document text
- https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/bututu.pdfIn PDF document text
- http://eia-edu.com/userfiles/file/88167650261.pdfIn PDF document text
- http://www.fred-robin.com/ckfinder/userfiles/files/wijotutonosizidoz.pdfIn PDF document text
- http://vom-ragnaroek.de/uploads/file/dedodetokekajezupa.pdfIn PDF document text
- http://jezirka-biobazeny.cz/UserFiles/File/wobavalofepobimujubuge.pdfIn PDF document text
- https://edenestates.com/ckfinder/userfiles/files/50256467955.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kali+linux+nexus+5PDF link annotation
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e25b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE25B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA6C	16148 bytes
SHA-256: `b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59`
`font_02_sfnt_off00010ffc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FFC	10112 bytes
SHA-256: `c09c54d9fe59d7dfb75d830d9ed656d98773556e25505202b46338ae8cafb464`

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