PDF malware analysis — malicious · c4538cd357211d4c

MALICIOUS

PDF

67.9 KB Created: 2021-07-30 17:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 3a04e497427da21dd1175dfcc871488e SHA-1: c1f266f0d1c193e02e098454a1842d11d9e7c972 SHA-256: c4538cd357211d4c1aa1ecc0c6fc264576adb5d72acd1f0fdbcff0d52116eab3

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs suggest an attempt to distribute further malware or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.7971

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/758dd7298ba6a112f5b0400808fcd45d/peziniwonutobisoz.pdf In PDF document text
- https://hondamienbac.vn/userfiles/file/68796624842.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc01aa40a---vominon.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-2/20210502035910959586.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a1b59dc33993de82f8362af442c0ec36/20068119463.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855222ed06b---jadikanoluzofumulaxifakov.pdfIn PDF document text
- http://dlt-nkp.com/fileupload//file/14623797131.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6f84bb5534965c1c1622e44d2fec7e97/befozibubusod.pdfIn PDF document text
- http://dragoniresorts.com/userfiles/27741487442.pdfIn PDF document text
- https://arichaindia.com/userfiles/file/lasejaxugajaf.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f776db40---jaxezisowebakeveme.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/18adddab1639e1c36997e9a36ed45ae3/rifanukipovomiluba.pdfIn PDF document text
- http://lakehighlandsrw.org/clients/863582/File/80302243586.pdfIn PDF document text
- https://ecoledesgourmets.com/userfiles/file/rinajozepoviwane.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0923ca34da339e2cfed8518f137c5f4c/botilaj.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/en8h1un2vcfu2eeveaj285dn0s/kimunesabitofuluretemo.pdfIn PDF document text
- http://mfcwestenkwartier.nl/beta/userfiles/file/gakamafepisenigaxavuteme.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2fe3dfe7---30192352554.pdfIn PDF document text
- http://capmar.eu/userfiles/file/lewaduguwupikozi.pdfIn PDF document text
- https://alianzatours.com/imagenes/file/81544162489.pdfIn PDF document text
- https://zlatartopalovic.rs//files/41349528734.pdfIn PDF document text
- https://vientangluc.com/upload/files/mutakewurirosuxozopuk.pdfIn PDF document text
- https://iaetindia.com/ckfinder/userfiles/files/wuzevu.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2901377d9b---falupotogomulominezowumil.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/854371ed81d4507fd2cb675c13613d24/velak.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=macbeth+multiple+choice+questions+and+answersPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dc90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC90	11244 bytes
SHA-256: `2fb8846b3bef486824af88d206d83c8539d5003283c3759f3d6ea5d8bacd780f`
`font_01_sfnt_off0000f659.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF659	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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