PDF malware analysis — malicious · 55b6273db290da46

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 10:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 192342cad503ce680c5a7234c0beb542 SHA-1: a15cd4d6b80515a452fa5c4c509c53ec4c3138a8 SHA-256: 55b6273db290da46cb4dc0a9b32554fda2c189344ccd390f8949d5340136c5ad

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of links to potentially malicious content suggests an attempt to lure users to malicious websites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=andrew+ng+notes+deep+learning PDF link annotation
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/27181d0885415a35a8d0f6678a7fe9cd/livefepewosebe.pdfIn PDF document text
- http://helloslow.com/data/userfiles/files/98206895554.pdfIn PDF document text
- https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/67936466074.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/86143c74453e060137523401e6e6aeb6/nawojavepaxilebixara.pdfIn PDF document text
- https://psihodesk.ro/ckfinder/userfiles/files/58961589667.pdfIn PDF document text
- http://lightofislamonair.org/uploads/files/29015358146.pdfIn PDF document text
- http://hoteldanang.vn/uploads/images/files/56162405330.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ab349cd718912759409c05c066540a12/39415380883.pdfIn PDF document text
- https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ebfb92da28e7b70ddd8bd31f13ab12a2/9126137652.pdfIn PDF document text
- http://guowangcable.com/d/files/49111752542.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8f308f6c2fbdd0dfb084153be11c33bf/vuvagizuvitizu.pdfIn PDF document text
- https://air-separation-supplier.com/d/files/98900703531.pdfIn PDF document text
- https://akilanews.com/ckfinder/userfiles/files/89738151572.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a938d121d2e---20037386899.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a453e392---xasulajexumew.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badd4ddf560---mupafalam.pdfIn PDF document text
- https://binarbaidservices.com/public_html/userfiles/file/vowupipokitapugubeviwikig.pdfIn PDF document text
- http://zonweringnederland.com/ckfinder/userfiles/files/50965600362.pdfIn PDF document text
- https://easypayindia.in/userfiles/file/72265837737.pdfIn PDF document text
- http://garderoba.sk/images/_file/lamifefivikukafeta.pdfIn PDF document text
- http://s2ipower.com/survey/userfiles/files/67364717264.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ce281649---20832775599.pdfIn PDF document text
- https://www.prshots.com/ckfinder/userfiles/files/gekasuripof.pdfIn PDF document text
- http://tbm-mova.by/images_from_html_editor/file/31901682641.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dljfem0f9m550d0qlmfrh87ubb/daninujo.pdfIn PDF document text
- http://shepardinteriordesign.com/rw/upload/file/xalifupasaretadiworatuj.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_off0000d6e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6E8	10636 bytes
SHA-256: `97f16b093b8df26ba057a51c84ce0230d206fcf1a0d4bcb56232dbf0f83bfadb`
`font_01_sfnt_off0000ef38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF38	17828 bytes
SHA-256: `d336964dce38f9ddaf2d895fbf18e498016ff75142e5895019f7dffccb58a1bf`
`font_02_sfnt_off00011de3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DE3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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