PDF malware analysis — malicious · 0d9fd0e95ed1136e

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 22:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ea8442a576a9530d099b0b8e7587fe0f SHA-1: 23cd58658ffc206dc69bee2dc846c359e0cc6a7a SHA-256: 0d9fd0e95ed1136ec8c757a7f31dfaec2562bfa1e06ee2cf01a03d4e899011fd

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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 https://sambelteri.com/contents//files/68522454197.pdf In PDF document text
- http://selidbe-beograd.info/files/33438437583.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m04mhqifp78fvdou8a1vdq36e7/sedumekafabawubawinelovi.pdfIn PDF document text
- http://zabradli-znerezu.cz/userfiles/file/46983912329.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fcf22bec9---40648738820.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/96088908954.pdfIn PDF document text
- http://mediasingrid.com/js/new/fckeditor/userfiles/file/6160897464.pdfIn PDF document text
- https://ctners.com/ckfinder/userfiles/files/75494009097.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd607e68ae0---47179190595.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ca7ab9912f91b028050f0b75b19216b0/96105402984.pdfIn PDF document text
- https://liantoong.com/archive/upload/files/jafosuroteninirakexe.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e711cde8c---92426115900.pdfIn PDF document text
- http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/85773552836.pdfIn PDF document text
- http://pzhjintai.com/upload/files/xurakaredeveguxixakejupi.pdfIn PDF document text
- https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/qi9tmpruong27l0nnhge39pg9h/62059698396.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=conceptos+basicos+de+relaciones+internacionales+pdfPDF 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_off0000d314.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD314	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB2B	10784 bytes
SHA-256: `da84336e1eb456731be6b342fab22995178854a85152b76d4fc47232a09eba4c`
`font_02_sfnt_off000103e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103E9	18660 bytes
SHA-256: `cf0de07604567e7c0579792619bca371655de549fa541ee0903a51d2cddaa335`

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