PDF malware analysis — malicious · 4693bfa65f77723d

MALICIOUS

PDF

86.9 KB Created: 2021-07-19 04:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: dae6fddd499d377b01f5a39513c1480a SHA-1: ca18926a6d9ad10caf7b285464c1645d230f75dd SHA-256: 4693bfa65f77723d52a0442047f990b98ab63ca58aff24ac481f3fa1434c23d2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a larger attack chain, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 5

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://charivne.info/images/file/kewupijutebel.pdf In PDF document text
- http://coreaad.com/DreamDataUpload/file/binobu.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b6e093df8d3ab9ab144ff1fc6568ac02/71649517613.pdfIn PDF document text
- http://seabeachthailand.com/UserFiles/file/finajojinejirifi.pdfIn PDF document text
- https://ankaratemizlikcim.com/depo/sayfaresim/file/fojeliguzijovur.pdfIn PDF document text
- http://wisdomtours.net/upload/file/wejexijidemufibena.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb8953efc3---namunoxizopipubos.pdfIn PDF document text
- https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/bc28ff23c9eda3011dbd0ffec2bde2fd/rafasolagorebibo.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebcd59e7f---37243722438.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf5a5f0aa---vubojola.pdfIn PDF document text
- http://sunnysidehighschoolclassof59.com/clients/867562/File/14802377243.pdfIn PDF document text
- http://interstroy96.ru/uploads/files/xuvizanorobekuzesuluzeb.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d86fbf210---40634027005.pdfIn PDF document text
- http://akademia-jedenastka.pl/zdjecia/fck/file/kinijusere.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d92e58a51b42816bca06410a4c520e66/wakibuxavofaxamajesuv.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4373ce7e9d631ece49a752c1de800a96/90112412421.pdfIn PDF document text
- http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/0kqhqmaao9i5lmqtti4ioqjum4/vuvurasewawug.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bf9527e0---vevasasesiwaxi.pdfIn PDF document text
- https://swalaya.in/userfiles/file/gavik.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fcdbd1614---15608434363.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/33bb7acb81c58e4db82253d3464ed125/juzolokab.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c50aed6acfc---pezib.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/726450fba9ca7e59c4cd174bf6c975b4/duratejokuxepegona.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/52cd78b784b621febc1f39d681010aa1/69605842814.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace343a036---53339594539.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072554dda1a9---16433311379.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=icse+physics+class+10+current+electricity+important+questions+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_off0000ea59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA59	18492 bytes
SHA-256: `27a075969a31330a537d26ba3692e677f389cc5f962e016b744b99944d391d3d`
`font_01_sfnt_off00011b3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B3C	11368 bytes
SHA-256: `4fbc9aa7e88239b1338ceb236726062c917f147f7c139022c965d8a4cb1742e2`
`font_02_sfnt_off000135a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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