PDF malware analysis — malicious · 590109e3366da65a

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 20:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 815915c9f7735484d4d33fc51473cc31 SHA-1: 3ada9c6426439b6428e6090d871e2ff54c01ce09 SHA-256: 590109e3366da65a71e7731aa4933ff39e6d518d182a41fc9ab456db1f86474a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. It contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://studiolegaletrotta.eu/userfiles/files/75276371629.pdf In PDF document text
- http://nuklearmedizin-amro.de/userfiles/file/59501652785.pdfIn PDF document text
- http://artospace.com/pics/file/75616722256.pdfIn PDF document text
- http://domosplast.hu/files/file/21905589634.pdfIn PDF document text
- http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zokafi.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3fe97deb2---vinajafakapiwaf.pdfIn PDF document text
- https://mcgbaharat.com/userfiles/file/katinogepitegosowizu.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3d0c3b0b---joxijetoketazik.pdfIn PDF document text
- http://anm-av.de/uploads/files/mopalukududef.pdfIn PDF document text
- https://suavitinhtannha.net/upload/files/36574120087.pdfIn PDF document text
- http://wowbond.com/upload/Fckeditor/file/64795714921.pdfIn PDF document text
- http://joltiy.ru/uploads/files/24881539762.pdfIn PDF document text
- http://luatsugiadinhviet.com/upload/ck/files/porawopa.pdfIn PDF document text
- http://auto4-spb.ru/public/images/ckfinder/files/50762494116.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676f145061---tililasovotozudeb.pdfIn PDF document text
- http://happyland-nsk.net/ckfinder/userfiles/files/49396212085.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615177424086e---debodewiborevedutajosu.pdfIn PDF document text
- https://dreptultau.hotnews.md/upload/userfiles/files/9233580538.pdfIn PDF document text
- http://peknanevesta.sk/media/file/74447566941.pdfIn PDF document text
- http://dailythang.com/userfiles/files/sipibesifom.pdfIn PDF document text
- http://roberthalasz.eu/uploads/file/petekamigepufegowuzem.pdfIn PDF document text
- http://dkmmotor.com/files/userfiles/file/5682794756.pdfIn PDF document text
- http://modernplating.com/userfiles/file/latumatumonebaf.pdfIn PDF document text
- https://stepweystudy.com/ckfinder/userfiles/files/9411808089.pdfIn PDF document text
- http://asja-doll.ru/userfiles/file/3680992487.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=call+it+what+you+want+lyrics+taylor+swiftPDF 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_off0000b1ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c9c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9C5	10632 bytes
SHA-256: `6bcd133cea91955b0ce236f98e5153dc457f32540511dff689ca753341566e76`
`font_02_sfnt_off0000e224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE224	14852 bytes
SHA-256: `5322833ee601845f7d6631e95e97eacaef1de57c45108226053561e667fa58a3`

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