PDF malware analysis — malicious · 3d2f19c5e363220f

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c8801eb3acb8394917963af4e4f9616f SHA-1: febf54edd52ae13f27856f092a371c1070340cc1 SHA-256: 3d2f19c5e363220f197e078ffb543a3e4f62700f4f5964bfe29b4f47571c988b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's intended to lead users to phishing or malware hosting sites.

Machine Learning

Nyx PDF Classifier malicious score 0.5466

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://icrs-as.com/userfiles/file/75815943750.pdf In PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a519da4b9e---pisefukatija.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1inn5vagdsrkfjgbauq82hdqu/70067726620.pdfIn PDF document text
- http://louisamerino.com/userfiles/file/nedewexogunuxuvusitesas.pdfIn PDF document text
- http://hongdanhaudio.com/luutru/files/34541170173.pdfIn PDF document text
- http://parvazyab.net/basefile/api203/files/32103823949.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613253c3ae579---44846659814.pdfIn PDF document text
- http://vibrobreaker.com/files/files/16253127301.pdfIn PDF document text
- http://remont-etalon.ru/upload/files/zojaga.pdfIn PDF document text
- http://tg-focus.ru/userfiles/files/tizokoro.pdfIn PDF document text
- http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/94152664917.pdfIn PDF document text
- https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nogesewamabarazo.pdfIn PDF document text
- http://www.fashiongale.ro/userfiles/files/85311124079.pdfIn PDF document text
- http://biogenetec.tw/image/files/20210903_142256.pdfIn PDF document text
- http://klinok-saintp.ru/files/mufiv.pdfIn PDF document text
- http://www.arborvitae.cz/ckfinder/userfiles/files/xixujoximijuxipepifafewun.pdfIn PDF document text
- http://phonphangschool.com/upload/files/xanoparixalarimo.pdfIn PDF document text
- https://rusepress.com/uploads/wysiwyg/files/97303939562.pdfIn PDF document text
- http://laiyi-art.com/userfiles/file/12592512863.pdfIn PDF document text
- http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99666919759.pdfIn PDF document text
- http://jocoseatee.com/userfiles/files/40502915781.pdfIn PDF document text
- https://bibonatura.com/ckfinder/userfiles/files/87669570573.pdfIn PDF document text
- https://treasurehunterdetectors.com/ckfinder/userfiles/files/nixebifodokesubarare.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/77919243773.pdfIn PDF document text
- http://ziva-muzika.cz/files/file/64101984557.pdfIn PDF document text
- https://www.sesc-am.com.br/Selecao/ckfinder/files/24788074653.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+to+facetime+from+android+to+iphonePDF 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_off0000f1de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1DE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000109f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109F0	19140 bytes
SHA-256: `74130fe81bbd07a80d1a3b1d77d1ad8433403f261245bf0a08476b47a4bad0fd`
`font_02_sfnt_off00013c17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C17	10892 bytes
SHA-256: `38505b6a42845cb37033ab77a1876f0fc4dffa0407a89f8483773858a7a8ec79`

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