PDF malware analysis — malicious · 0acf52b361129cce

MALICIOUS

PDF

84.9 KB Created: 2021-08-04 02:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d91904d57ee55bcb13e8569cf34c7b36 SHA-1: a4d04858be3c167cf59105ea1d235c02360ec72f SHA-256: 0acf52b361129cce3f457b8fc85867f4a73746b3b4e7ded6c0a1f91955949023

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier strongly indicated maliciousness. The primary purpose appears to be acting as a link farm to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9902

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/651e6bvlc6vrmai2g34c5kb6e6/dusij.pdf In PDF document text
- https://medsplus.us/admin/images/file/givosotasoxibosazetujipi.pdfIn PDF document text
- http://headrepublic.pl/images/files/20801996901.pdfIn PDF document text
- http://alompar.hu/uploads/content_files/files/24574059902.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1dcjkv747kucenfql6phj8m9he/xebeti.pdfIn PDF document text
- https://festival.bg/fckeditorfiles/file/lapitepedudogibani.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957127c8b5f---3700057109.pdfIn PDF document text
- http://plkorea77.com/ckupload/files/9199442864.pdfIn PDF document text
- http://vitajeans.com/ckfinder/userfiles/files/82703643195.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6df201fd712d24de69cb6659f1041529/65613717127.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f62783950529a54c92028d5ce540d1ce/77805983446.pdfIn PDF document text
- http://top1np.com/ckfinder/userfiles/files/7135382883.pdfIn PDF document text
- http://immopolignano.lu/images/robavebuwu.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa5dee79a---tilakokodorifilinotefanil.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae9f85384---lafutuwawawedekegisaw.pdfIn PDF document text
- http://uctodane.cz/UserFiles/File/78699173334.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f9f084cb38f4fdec6260eac251ad96c5/naliralikuwapoluf.pdfIn PDF document text
- https://etadelloro.it/images/file/73401832558.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609010c9372b6---roxiveku.pdfIn PDF document text
- http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/dumize.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cgj9mn7ih2f3jm6ti5cjjjij8m/tefafefevigif.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/efa3892aae0e717bce86b3b3a82d0347/16657635538.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mnq6k1c3bsgd3558drg9m64sm8/mukitakep.pdfIn PDF document text
- http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a5785bf---kisokemigiw.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d347ca20a---xirilirivigimenafodavimo.pdfIn PDF document text
- http://teerosy.com/ipp/images/uploads/files/15092076239.pdfIn PDF document text
- http://eros-arena-reutlingen.de/eros/userfiles/file/dugenesugoxuva.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=livro+direito+processual+do+trabalho+pdf+2020PDF link annotation
- https://doi.org/10.5752/P.2318-7999.2020v23n45p385-404In 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_off0000e1b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1B7	19420 bytes
SHA-256: `5f6b4110ab8bf54948485913cf416d44e1628147c6e8814ee8bc6793e9005597`
`font_01_sfnt_off00011223.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11223	11116 bytes
SHA-256: `405ad454a232c2b5bb0c8ac35fe120d916b259ce79df2cc3fd12988e0e5654b4`
`font_02_sfnt_off00012c0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C0B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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