PDF malware analysis — malicious · 4789adbd55002a24

MALICIOUS

PDF

78.6 KB Created: 2021-06-25 23:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: e0ce60a00f31c93bf95e28e9520e9ec2 SHA-1: bb8396869353bae62f43c79cc706154d2c677dd5 SHA-256: 4789adbd55002a246b6e80bb98dff12d4e6fd9848445b113e4f80640ac22133d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to leverage these links for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

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
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://archism.ru/uplcv?utm_term=little+bo+peep%27s+library+book PDF link annotation
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5466e91ff---77972565083.pdfIn PDF document text
- https://sssmri.com/ckfinder/userfiles/files/podoz.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a363eb1bb44---sutepufegida.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15ed22568---4843955716.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ccrbs3vd1thnnq484inq3q5s17/rozaxevudoxero.pdfIn PDF document text
- http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4369e5a46---80534524679.pdfIn PDF document text
- http://georgekoldun.com/var/upload/file/wuvag.pdfIn PDF document text
- http://dpsszczytno.pl/photo/file/bupatibigiso.pdfIn PDF document text
- http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65823153866.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa3bd4a45---rejasopujuvebimej.pdfIn PDF document text
- http://diysmart.net/userfiles/file/raruzavatexulixijenuwesi.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/todapifiretuwuzosogidi.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/c4fteak4lvc2slfgeb8uhtgp3m/fenuguribuxeraku.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/20755396172.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/sumimipa.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9a268065fbf92e178f842504b6616445/69046740687.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160988d30d6df3---bamigebadidewibukib.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6f00fa5b---rogexoxiwu.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f99cfdce9c78335e3a38a9db5e679c31/85310159993.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p74vnchles49hr7rhs93rk71pt/7793733755.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5d537fee921399c3d176bd91dd2a28cf/bakaliwaxugigisekunuvu.pdfIn PDF document text
- https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6f4b3b06c7e44bfe69567681e57a47b/zuxatefolop.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072189ddd2ba---femakabogug.pdfIn PDF document text
- https://brickbodysupplements.com/newerac2c/userfiles/file/pimibebilajagide.pdfIn PDF document text
- http://architects-desk.com/uploadsfile/xixariramebonaxupa.pdfIn PDF document text
- https://actor-conseil.com/files/file/susufekonitukogotujudesu.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_off0000cf63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF63	17416 bytes
SHA-256: `57d374456323e7ae7894d28d329de179bf0c92e83ad2b408b089aaa5a0468c7c`
`font_01_sfnt_off0000fcea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCEA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11501	10480 bytes
SHA-256: `71019323cf9cbca70a570b62110f2347341e7986a918986772b569ad2277d77e`

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