PDF malware analysis — malicious · bc53a0c347e9a96d

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 09:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9f9334454f2fe0e667dd3bd21c85bc78 SHA-1: 48832929292b644fecc4c5a4e9805158ccda5569 SHA-256: bc53a0c347e9a96d3f34e3b63c023f8d161702154ced84b1d0aab70629e1d1ad

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to facilitate the download or redirection to a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=laboratory+safety+manual+osha PDF link annotation
- http://stlnsk.ru/uploads/file/munusulexukiwapobawi.pdfIn PDF document text
- http://atomleasing.ru/media/File/zejimezewavipulidota.pdfIn PDF document text
- http://lnianemarzenie.pl/userfiles/file/xawexise.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160820df60c30d---4979349391.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e749a2e31---76019570101.pdfIn PDF document text
- https://dongciao.com/uploads/files/202108301219512376.pdfIn PDF document text
- https://lingchuanfloor.com/app/webroot/userfiles/files/nuvaxobogufatopaf.pdfIn PDF document text
- http://austintownfitch1980.com/clients/879833/File/keduremifutezebiwikexin.pdfIn PDF document text
- http://poltinik.ru/userfiles/file/todunuzemivu.pdfIn PDF document text
- https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/af1a9bde237147836ab2b6b9eda21e3a/favovenufaka.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/332e8886a38c8fd4c8b2b73c49d9cdc3/37165588309.pdfIn PDF document text
- https://ppuhperspektywa.pl/files/edytor/file/favuzabamoz.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/571a86d3482d5b55c4f29147402a62e4/23117086328.pdfIn PDF document text
- http://j-line.ca/fck_upload/file/rikiwel.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6ea98e46---duzatasidara.pdfIn PDF document text
- https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3d9f4ab7f1ff5349fb3c1129fd1a99e0/kuxufumi.pdfIn PDF document text
- http://minhphucvietnam.com/uploads/userfiles/file/vawamuxupamu.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba55b8574d---kitolipepevigotototafatos.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c78357127---10202110219.pdfIn PDF document text
- https://peterdegendt.be/file/93115812819.pdfIn PDF document text
- http://vtdsbinhthuan.vn/public/uploads/userfiles/file/nipuwavavajafilus.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9u63hrhm5kq31nr28gtra75p08/82260595294.pdfIn PDF document text
- http://travelci.ru/ckfinder/userfiles/files/poruvadupi.pdfIn PDF document text
- http://fisioterapiasuzzara.it/userfiles/files/rezabekek.pdfIn PDF document text
- http://zoncmswebsitebeheer.nl/files/editor/file/vusabobaduziliri.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7B5	16600 bytes
SHA-256: `df7825508d1c407e2c0febd76ac432ff468a6148cee226971537403aaf560fee`
`font_01_sfnt_off000102a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102A0	10696 bytes
SHA-256: `43193f761da75fe5fde30690230845acfb156987923bc9947f3121678018184b`
`font_02_sfnt_off00011b0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B0F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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