PDF malware analysis — malicious · 5b7752c1c6901e2b

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 15:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d3b40329a1e480752027fbb4bae3ba79 SHA-1: b62693b2e300561d52d24bb7ea1c2c46596b5ba3 SHA-256: 5b7752c1c6901e2b638f9156e6b87a29729d1df7a784b848b1a2fc4c36b96ebe

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to potentially malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ieg9bolu1kusvu74tshgms42ha/59206931698.pdf In PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040d607d39c---tukepinediwowi.pdfIn PDF document text
- http://cukierniabrzezinski.pl/www/artizam/fck/file/51230668330.pdfIn PDF document text
- https://angkagenap.com/contents//files/5949912202.pdfIn PDF document text
- http://ylphs.com/ckfinder/userfiles/files/86605988368.pdfIn PDF document text
- http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/roxuxomarip.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ec8e90e5916ea73dbeb96e5895ec3ec0/12101504554.pdfIn PDF document text
- https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/v1lp82iphok2g50lqtru565e33/mubimisodibopirirajuk.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/4816b4075cf5bb3a6af7f7dd50e92830/zazedemenogarexawefuxewix.pdfIn PDF document text
- https://5of7edwardstreet.com/assets/media/files/tofizagidedevofirowukenam.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a80229411---ponas.pdfIn PDF document text
- http://vgkbuilders.com/assets/files/ximatop.pdfIn PDF document text
- https://stpeterscbs.ca/ckfinder/userfiles/files/vidotiwajox.pdfIn PDF document text
- http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/bitijebenusexij.pdfIn PDF document text
- http://otoozevran.com/resimler/files/gadabibilenufaxikore.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d309cfdc9---47971033676.pdfIn PDF document text
- http://wskinbody.com/data/boardData/files/90243545039.pdfIn PDF document text
- https://dom4m.by/userfiles/files/32408262816.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78b4b84adfaa4bafbf969220de4792c6/23004919579.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119aeb131829---pojagokuvakubuwew.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081183eba42f---96056170920.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/33408487716.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160791a09d1e01---56116441694.pdfIn PDF document text
- http://www.deopendeur.org/imgUser/file/35738436487.pdfIn PDF document text
- http://diamantina-joaillerie.com/ckfinder/userfiles/files/lodudozojuvuna.pdfIn PDF document text
- https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f1af6684d183559fdcd21340776e1a3b/dudoku.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c571cdebb5c---pibukasawobidusofo.pdfIn PDF document text
- http://mmt24.ru/files/file/pogesufukejarej.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=conclusion+sur+le+paludisme+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_off0000d59b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD59B	10812 bytes
SHA-256: `7f730a9144ff440d42ba2495227693989892c28b69e9e81566822d7aa7c726cd`
`font_01_sfnt_off0000ee82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE82	19264 bytes
SHA-256: `f65ca93f6173936a4d0e7e91ab5304c7ab2d8b7712a239cef9c1fea4104da3ae`
`font_02_sfnt_off00011e80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E80	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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