PDF malware analysis — malicious · 3fead49e5891d91a

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 19:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 33ad830c2c4f8ec9e1e337fb42c541db SHA-1: 6aff68919a79ca958ffadf468ec0bd971ac66b9c SHA-256: 3fead49e5891d91a02c63777cfc2f28247626d2ba69b2a0d2b36d8355ebce729

164 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 WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab698f83b---94002673204.pdf In PDF document text
- http://skazka76.ru/pic/userfile/61310790463.pdfIn PDF document text
- https://stiff.pl/ckfinder/userfiles/files/napirofalitasagituxajawoj.pdfIn PDF document text
- http://agroanaliz.by/upload/editor/files/71688343534.pdfIn PDF document text
- http://ilkyoukais.com/Images/Media/files/fibozuvisore.pdfIn PDF document text
- http://studiobaliva.eu/userfiles/files/foruzevofejikerobajub.pdfIn PDF document text
- https://brillimet.com/uploads/files/202109032059072088.pdfIn PDF document text
- http://bdn10.cz/files/file/wojiwawojetufevixizunuf.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1d6c2fa9d7035a2c8e9da45fb20caf21/43793466535.pdfIn PDF document text
- http://burningspearmarketplace.com/js/ckfinder/userfiles/files/10074650463.pdfIn PDF document text
- http://oilmachineydy.com/d/files/zuginugo.pdfIn PDF document text
- https://nusamulticentralestari.com/Uploads/userfiles/files/42888927731.pdfIn PDF document text
- https://savitravel.ro/ckfinder/userfiles/files/80932974797.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408d9a87b54---xujonapivijotexigomatude.pdfIn PDF document text
- http://eluvial.com/sites/all/sites/eluvial.com/files/xafumodopoxijoneteletinu.pdfIn PDF document text
- http://podhoru.cz/userfiles/file/63963416664.pdfIn PDF document text
- https://crownprolaw.com/userfiles/Proj_Name/files/jegosak.pdfIn PDF document text
- https://vibangthuaphatlai.net/uploads/files/97365437001.pdfIn PDF document text
- https://newsale.linyn.mobi/upload/ckeditor/pages/files/gotuveduvuvubosuvijijo.pdfIn PDF document text
- http://gangwonbnb.com/FileData/ckfinder/files/20210919_AE4AE6A2D3F92BCD.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413598e0285---toritibanize.pdfIn PDF document text
- http://le383.com/uploads/files/gifoban.pdfIn PDF document text
- http://sloplast.com/userfiles/files/72171071528.pdfIn PDF document text
- http://growlink.biz/userfiles/file/7407434593.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=methods+of+mathematical+physics+pdfPDF link annotation
- https://tes-sys.com/uploads/ckfinder/files/20210905/16308558933155.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- 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_off0000dda5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDA5	10788 bytes
SHA-256: `1b3a4141b377fa1024ae6311c8954bdc4d5447f168ecfaf6b2752e089a578b12`
`font_01_sfnt_off0000f68e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF68E	17580 bytes
SHA-256: `49057399c7fb7115ea15bf1f6af83b49e975d6b3b3c80de9400ad0a190621933`
`font_02_sfnt_off0001242d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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