PDF malware analysis — malicious · cf9f093565ffa190

MALICIOUS

PDF

89.5 KB Created: 2021-07-24 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: eeb688cc6ed08bc132fc04a458e637f1 SHA-1: 8d8d1760b3e7cac81f8b6bd1de8810e605928bda SHA-256: cf9f093565ffa190e5d955de3ade53bec221d267405dfe8c95c849d619ae2488

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://cn-junsheng.com/upload/file///202162845375652.pdf In PDF document text
- http://bezpiecznamlodosc.org/files/file/63607047866.pdfIn PDF document text
- https://parokisantolukas.org/Uploads/userfiles/files/xenexuwidixawu.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160811151eac71---pilususib.pdfIn PDF document text
- https://bharatbiodiesel.com/userfiles/file/31400106031.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a32bb187---jotimajunugovudefu.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f03c6df26900ec2c7f46656c9f6d5f54/xiwilina.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a58892e896cc44d9f3acaa8cae01bd77/mifevotorateviziwesow.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0b8e026cf776509686f764338dee01de/fosibera.pdfIn PDF document text
- https://bostaninsaat.com/image/files/fewedofelalojenoxivapade.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7341107bce5a6c039410f1c0ef32d862/72270734499.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3c19b671c18cbafcb0944b7d423905a8/dekuguza.pdfIn PDF document text
- http://solyaris.pro/admin/ckfinder/userfiles/files/5972529238.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac93034bf---bexikijapevotobabuxole.pdfIn PDF document text
- https://diedacorporation.net/freesiafiles/file/togeb.pdfIn PDF document text
- http://asea-admin.com/_userfiles/file/20210502155340.pdfIn PDF document text
- https://miet.hu/kepek/34689227756.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bd0cd4346f2f5f27ad57c10d0825d028/32287330518.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/m13ul4pm3u8t2qniqo5aht2194/89071505406.pdfIn PDF document text
- https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7176f1828---xolijuxoga.pdfIn PDF document text
- https://designclarf.it/file/10116249784.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8b8b008eb5a61bcdb045f296a372eef9/wefazuni.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e1707e61492d41a508d2d203861dd0e3/duginizototol.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe89bc3a4f---4779770163.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/98748524299.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pasternak%27s+body+reset+diet+planPDF 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_off0000f8dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8DD	10768 bytes
SHA-256: `f8ae4e60e49b79f6902c9ecd23746e1036f90c26a091c09e5444f6252f626d8c`
`font_01_sfnt_off000111a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000129b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129B2	17384 bytes
SHA-256: `ffb585bfaf3afb9e58f76fcb71b67fd607e528ec1ce15367da7c392e0ddaa90b`

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