PDF malware analysis — malicious · b1225d83f77eff5e

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 15:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: acc82e8c4c9863c3073d6d0223b0bfff SHA-1: 961a983c908c85232e89b1427b07966dc0662f83 SHA-256: b1225d83f77eff5eb2a90f71c40eb65870f7151dd92ec9a6ffca0acdc71dcab1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=shikshan+adhigam+ke+siddhant+book+pdf PDF link annotation
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a667b5e447d---wujozem.pdfIn PDF document text
- https://gelblighting.com/userfiles/files/9070368684.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/236383879f40f5c3e2431449cc13e003/39649048660.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3a115e783---59984785742.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2941f32d---56762149248.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-4-29/20210429150454533031.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9fcd02d1---wurijil.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1622506552.pdfIn PDF document text
- http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa840da3b26497ae38abb208a3f524c9/vogifawakakojuxu.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/206129411667923c7261e8094abe185e/zepebuvovigomovuwadobir.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607347ddd3c07---2885150270.pdfIn PDF document text
- https://actaviaserica.org/board/file/files/69922011060.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da99f8ec05---sexatawew.pdfIn PDF document text
- http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/24867752006.pdfIn PDF document text
- http://banlinhkienlaptop.com/userfiles/file/6720121229.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab12e8db0---98029527291.pdfIn PDF document text
- http://centreforeffectivecoaching.com/media/file/49921345974.pdfIn PDF document text
- http://imi.vc/upload/files/39715688631.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u8e5ldiincltuob941j6cla5vi/somaxinitijilovulo.pdfIn PDF document text
- http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sawexuguriw.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/wowidukaxepetolesevotuk.pdfIn PDF document text
- https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/75707378814.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a8dba2608cd0af14ec74619a9f81be7a/96419235328.pdfIn PDF document text
- http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/wenemivuwutajad.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_off0000c7b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7B5	11108 bytes
SHA-256: `0eb7601a921d1103f82988600c64eb2b960cd70c3ceaf81833cc710c4ba35c5f`
`font_01_sfnt_off0000e0fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0FB	19872 bytes
SHA-256: `7de36d2062504c80f16fb2985cfa3f6c028697cde0ea0c713deeab228287c627`
`font_02_sfnt_off00011599.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11599	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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