PDF malware analysis — malicious · 61c93aa39853c6e6

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 03:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e6442cbb5bc14b6bc9ab6f606efd7534 SHA-1: 9f4ffdd8ea5610017c9bd940a9d5e6253734aebd SHA-256: 61c93aa39853c6e6c60db463b33584cf8194d68442ba8d69b9d12747ead9a6d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF itself contains obfuscated content, but the presence of numerous external links is a strong indicator of its purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/bugizuxenemamonofoxivujef.pdf In PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d010e0506a---gerupalubebonikixi.pdfIn PDF document text
- http://caratow.nl/userfiles/file/totim.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/80a5fd04f0d2c6d5d4febee7a409ca19/69640352590.pdfIn PDF document text
- https://actor-conseil.com/files/file/41586449662.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/69dcb3bd4d74289f81c1d7d6c64debb1/10224340392.pdfIn PDF document text
- http://iraneto.com/basefile/iranetocom/files/67148385027.pdfIn PDF document text
- http://www.look4job.gr/images/_user_na/file/53354453213.pdfIn PDF document text
- https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/97lrcs4rkns9bpc3gnq661o9k1/503536312.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/1f45006c183ea3ab28b9a72bcccb892a/1800929090.pdfIn PDF document text
- https://ready4use.ru/uploads/files/tufeteromeduruwufilof.pdfIn PDF document text
- http://connect-event.fr/ckfinder/userfiles/files/pobibegi.pdfIn PDF document text
- http://kaies.cn/upfiles/210629004006964247whufxh.pdfIn PDF document text
- http://www.pacautomarketing.com/file/81411945903.pdfIn PDF document text
- https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e0517f4e9dd697aec79b402d75247c90/75271857751.pdfIn PDF document text
- http://trustycctv.com/ckfinder/userfiles/files/71455156476.pdfIn PDF document text
- http://prime42.ru/userfiles/files/kekol.pdfIn PDF document text
- https://dutchfansitenetwork.nl/ckfinder/userfiles/files/7540704979.pdfIn PDF document text
- http://paradisoseminatrici.it/userfiles/files/92507616641.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76c67e615---xolawefolefo.pdfIn PDF document text
- https://sabresources.com/FCKuploads/file/sawojazipibojijibate.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a28c8e0e5d0ab1c37461261ff21d2881/35369098285.pdfIn PDF document text
- http://yanarfabrics.com/firma/files/92557599656.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/08bff15672c91a5017d41f00b957c539/84892914025.pdfIn PDF document text
- http://praxis-greve-polley.de/web/editor/files/15776489558.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/47e7f03e684455639278b9ff5c2d29c2/46600265032.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=verbos+regulares+em+ingles+com+tradu%C3%A7%C3%A3o+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_off0000e787.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE787	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF9E	11636 bytes
SHA-256: `a041ecee1d1bbdb3df14a290a5f4d4e966ba788f6884a9103972d339e8679df6`
`font_02_sfnt_off00011a27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A27	21928 bytes
SHA-256: `ff43776272ec938e930523a80136019004cc1051183a3d084c113929069f1d25`

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