PDF malware analysis — malicious · b45441bb07043128

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 02:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2dee1a7a756c46647c1cf3795a1ac1a0 SHA-1: 8d96202b74e8ce9cc3075134aaf2da4c79facbdd SHA-256: b45441bb07043128c1b018b5bf9919c41023a18f23a778b43caa38f0331de49e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to various URLs, many of which are hosted on compromised CMS upload directories. The primary purpose appears to be to lure users to these external sites, likely for phishing or further malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

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.
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 https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e05faa7bd436c0bab1ed6337b860b2e/vubenase.pdf In PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161174a075fa69---21412560317.pdfIn PDF document text
- http://fygl.net/uploads/file/231244445155.pdfIn PDF document text
- https://deniz-sogutma.org/img/userfiles/file/52938561115.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/84gcudqoemq0afv82l2515v02a/61806346313.pdfIn PDF document text
- http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/28338352529.pdfIn PDF document text
- https://danielstrehlau.com/userfiles/file/xedeteloferolegoxesijezuw.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kkg8ulhgr82v1rr6m1fjhto0e1/78748643260.pdfIn PDF document text
- http://truhlarstvisollner.cz/data/file/8051685984.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd837d23f00---59343635859.pdfIn PDF document text
- http://boldino-hotel.com/ckfinder/userfiles/files/tunafudiboj.pdfIn PDF document text
- http://bastola.org/userfiles/file/laferupu.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zulapopilidawakama.pdfIn PDF document text
- http://ets-sptk.ru/pic/file/mepobunulowizibubasised.pdfIn PDF document text
- https://wildarium.com/ckfinder/userfiles/files/tilurovupukemax.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d0d29c50f1e0f05a639617899de83975/29524624496.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4e307d76---82394864349.pdfIn PDF document text
- http://thanhtindesign.vn/uploads/image/files/nirobuxeferul.pdfIn PDF document text
- http://usateatop.com/_upload/files/3276094727.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0b5eba72---rurowenajukidewovazunit.pdfIn PDF document text
- https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f3cd1de593b8837636a3f00ff8c24bb8/5408370188.pdfIn PDF document text
- http://31kouqiang.com/userfiles/file/1623346261.pdfIn PDF document text
- http://beautifulmoda.com/userfiles/files/91626537040.pdfIn PDF document text
- http://davidlbrooks.com/clients/868292/File/46129944870.pdfIn PDF document text
- http://beiks.info/public/file/tegaron.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2527f27641---36680580972.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=adjectives+worksheets+pdf+grade+3PDF link annotation
- 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_off0000b954.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB954	15456 bytes
SHA-256: `d04ed8bc2d42056ffbe672e6fbf0ac60d86f73fd20bf6126ff756b5a7e7b5df8`
`font_01_sfnt_off0000e08a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE08A	11276 bytes
SHA-256: `afa75540fb9f1f98fb2fb3a280845a8a589ec853f2f11eca1c75a67f9f775deb`
`font_02_sfnt_off0000fb0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB0C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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