PDF malware analysis — malicious · b1d150210b5f6bdf

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 18:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 1623af9f252dafdc88ad1afabd700bcb SHA-1: 7b0cf11d4ea99afa867f068d1d9e1a28444fd6e6 SHA-256: b1d150210b5f6bdf0ba5f02dad7cbfd0fa648e2b2e1b5d1b66ee7ca047d6da11

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to potentially malicious or SEO-manipulated websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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 https://wastran.ru/uplcv?utm_term=apache+license+2.0+pdf PDF link annotation
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf1541283d---vobalovezow.pdfIn PDF document text
- https://gretajensen.com/ckfinder/userfiles/files/91788063968.pdfIn PDF document text
- http://nfraccon.org/userfiles/file/87094372529.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5b6c0d59---16224011575.pdfIn PDF document text
- https://horizontire.com/userfiles/file/dedemirabupovisitixolawu.pdfIn PDF document text
- http://potlista.com/file/files/nazimiri.pdfIn PDF document text
- https://aspaeng.com/files/image/files/zerenepobarapepepom.pdfIn PDF document text
- http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef65257509---bepiviselameduxipunoto.pdfIn PDF document text
- http://cuspsurgeons.com/userfiles/file/65784257564.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc01b61ce9---68768778325.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2c52e4072fb08c68a3e18424f9300659/97965160659.pdfIn PDF document text
- https://nestaerospace.com/uploads/file/91705795913.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/28c393001abecafeffc6a5773fe4f716/zujuzapixurolixozop.pdfIn PDF document text
- http://hoya-system.com/uploads/files/202108311208569964.pdfIn PDF document text
- http://vector-luczak.pl/new/fck_user_files/file/gozogetimixojag.pdfIn PDF document text
- http://homeopathyhk.com/files/kededilol.pdfIn PDF document text
- http://nanopena.cz/upload/file/vugaduzo.pdfIn PDF document text
- http://lasfyy.com/uploadfile/file/20210709070614923.pdfIn PDF document text
- http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/55157278240.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c403ac79---dakum.pdfIn PDF document text
- https://fsreloading.com/userfiles/files/tirukuzafadulewaxuvela.pdfIn PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9459cfe48---14777893883.pdfIn PDF document text
- http://asdgolfclubtoscana.com/writable/public/userfiles/file/3772267351.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d0dc9680d1f7a0e8ada4cc30a1150ce7/xerajamalodawo.pdfIn PDF document text
- http://ankurgroups.com/userfiles/file/jugilotemovoxukex.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d320.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD320	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB31	17272 bytes
SHA-256: `0b26e2b1dc1e2e63b823e913c9067d7a6e0ee737069fc8e0d1108f24df40a3f8`
`font_02_sfnt_off000104c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C8	17732 bytes
SHA-256: `9d88316024e6438421e5ac7b6f94b86c7f44562eb89865a399ad0343321cbec8`
`font_03_sfnt_off0001326b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1326B	10688 bytes
SHA-256: `bc2d8b6c9a81eb32106434ecf700fd5f1a8c8551fce8dfb171ff707de178910b`

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