PDF malware analysis — malicious · e6385b5f92f0d742

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 17:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: e3dd98105a38a2f5513d4399e19d3a91 SHA-1: 3bfdae958fd8f525c7ddc2091a4ed925081f994b SHA-256: e6385b5f92f0d74207286cec63e08a9202804104a09b36c4d59daec50659a29d

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to external URLs. These URLs are part of a link farm, a common tactic for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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.
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 https://pixomot.ru/uplcv?utm_term=miui+12+bar+at+bottom PDF link annotation
- https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/8099948987.pdfIn PDF document text
- https://quizai.com/uploads/files/83450816539.pdfIn PDF document text
- http://schodylux.pl/userfiles/file/ligazifowamupukunawegej.pdfIn PDF document text
- http://grawerlik.pl/userfiles/file/4274553796.pdfIn PDF document text
- https://hattshopping.com/admin/assets/images/ckfiles/55312025184.pdfIn PDF document text
- https://ises.ca/phpsites/vertical_living/uploads/file/36845880654.pdfIn PDF document text
- http://officinedesign.it/userfiles/files/82666952858.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af7256c053---mulaxokavara.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fc114e89dc14907f17afff0d8d445199/rajumikomalabenepeb.pdfIn PDF document text
- https://gionggiacam.com/ckfinder/userfiles/files/66894175211.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a2c582f9c---10012049537.pdfIn PDF document text
- http://hotspot-usa.com/js/upload/files/41187541000.pdfIn PDF document text
- http://plenaseguroseprevidencia.com/fotosempresa/files/5517021598.pdfIn PDF document text
- https://kham.vn/userfiles/file/muguda.pdfIn PDF document text
- https://saatyapi.com/upload/ckfinder/files/48433977040.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/fuwav.pdfIn PDF document text
- http://thietbikhachsanvinhhung1.com/upload/files/jilidegotawufabamutul.pdfIn PDF document text
- http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/200206114387.pdfIn PDF document text
- https://organicearthfiji.com/documents/file/1902975745.pdfIn PDF document text
- http://shoreluxurylimos.com/userfiles/files/jovelinozis.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/xewarejolanu.pdfIn PDF document text
- http://hoya-system.com/uploads/files/202109032038081721.pdfIn PDF document text
- http://euro-ex.com/images/blog/file/19738234395.pdfIn PDF document text
- https://transmar.biz/ckfinder/userfiles/files/butise.pdfIn PDF document text
- http://www.ks-klinika.ru/ckfinder/userfiles/files/99799318056.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_off0000cfba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFBA	17016 bytes
SHA-256: `b042f8c30e4057e31246165b85f602769b6f9c65825841fd5b3788c97925b2bd`
`font_01_sfnt_off0000fb57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB57	10224 bytes
SHA-256: `3383a411a542ea6d35740ec0d42163c8bf25c8c5c9607b39bf09b45d8e805d41`
`font_02_sfnt_off00011269.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11269	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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