PDF malware analysis — malicious · 856089e4a3e876b0

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 16:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b12fb11b3337e6196bc64aa64c159c8b SHA-1: 2c6de2945e7a1b8d7f146823c72a4063254a9095 SHA-256: 856089e4a3e876b05841c08bccb8162ee3cc6ab3889f86927d783d6d47334765

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The primary URL, 'https://smidgel.ru/uplcv?utm_term=garena+mobile+apk', indicates a potential attempt to trick users into downloading malicious applications.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=garena+mobile+apk PDF link annotation
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614485c8b887b---63534585567.pdfIn PDF document text
- https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46092018955.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/58616889947.pdfIn PDF document text
- https://www.delaneyllc.com/ckfinder/userfiles/files/zaledepavadedimoreru.pdfIn PDF document text
- http://baracenter.be/userfiles/file/zikutibuwojajutirugojo.pdfIn PDF document text
- https://autopsrus.aerovents.com/ckfinder/userfiles/files/18038015706.pdfIn PDF document text
- http://logicamail.it/draft/media/26000365647.pdfIn PDF document text
- http://saringkarnwood.com/UserFiles/file/lalozamopa.pdfIn PDF document text
- http://szm.hu/userfiles/file/gevetofigopi.pdfIn PDF document text
- http://altera.ukrstroyka.com/content/xuploadimages/file/25363091585.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a237ee0d3c---50547352279.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f074567608---22299238565.pdfIn PDF document text
- https://dogathermalhotel.com/resimler/files/purepekaxawuworalesedepi.pdfIn PDF document text
- https://tselectromechanical.com/uploads/CKfiles/files/furapojipag.pdfIn PDF document text
- https://onlineadda.organicemall.com/ckfinder/userfiles/files/molipo.pdfIn PDF document text
- https://baoholaodong24.baohohoanglong.com/userfiles/file/30439036327.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd43310c94---42345956439.pdfIn PDF document text
- http://irfanmakina.com/depo/sayfaresim/file/54749844291.pdfIn PDF document text
- http://novo-foto.ru/ckfinder/userfiles/files/11989801126.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6ce4b07c---65786516302.pdfIn PDF document text
- http://dailygameresult.com/editor/UserFiles2/files/25755627076.pdfIn PDF document text
- http://prochem.vn/images/uploads/files/7107866881.pdfIn PDF document text
- http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/7847509947.pdfIn PDF document text
- http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/fodibefasibapajo.pdfIn PDF document text
- https://bibliotheque-des-arts.com/ckfinder/userfiles/files/wiwijuxipokixedi.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_off0000c543.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC543	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD5A	10420 bytes
SHA-256: `0376fbc8a2efb7e46e42d493290bb9df637d94f1487295b429e7fff5123209cd`
`font_02_sfnt_off0000f49e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF49E	19976 bytes
SHA-256: `ee6655ed77411383985e1c97d2085c8495fd252f1f5595bb6e666e5e103f6062`

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