PDF malware analysis — malicious · e837f52a78de38b7

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 20:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 67994afda0b89542660a1b7b9166277d SHA-1: 306b51556000b753ab99ee6c1c3c96edb7e101c0 SHA-256: e837f52a78de38b7a716da638e5cd292eded5a6109cce2e39d58005dfe1bd77c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file that exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farm heuristics suggests the document is intended to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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=letter+from+the+heart+real+estate PDF link annotation
- http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3750860448.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1372b8d2---binafexaguvitafivovum.pdfIn PDF document text
- http://thevisionkharj.com/userfiles/files/tujorememugidu.pdfIn PDF document text
- http://ecohort.com/userfiles/files/42676431893.pdfIn PDF document text
- https://huaienclinic.com/uploadpic/files/napulusuxumubotumaj.pdfIn PDF document text
- http://yourhandmadeitems.com/userfiles/file/mijoliruxadime.pdfIn PDF document text
- https://apartmani-mestrovic-krk.hr/files/50172579304.pdfIn PDF document text
- https://pagodatalk.com/_UploadFile/Images/file/wofona.pdfIn PDF document text
- http://babyshelter.net/assets/upload/files/mifulowigurezu.pdfIn PDF document text
- https://ww150003.linebot.net/upfile/files/20210914142605.pdfIn PDF document text
- http://assisdrive.pt/userfiles/file/55330690614.pdfIn PDF document text
- http://mikomisushiwc.com/uploads/files/kirazipenede.pdfIn PDF document text
- http://soleilboo.com/images/uploads/files/miritobolomawan.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3ijjun55qd2cn7iv2l5dgpq41v/55325793196.pdfIn PDF document text
- https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/pisobifowigawopujufemo.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/77bf954bd382a08bafcc27b61c311644/kazifiwurawevitadowijuwif.pdfIn PDF document text
- http://globalbando.com/DATA/upload/files/202109051808351237.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614363623d89b---18699429621.pdfIn PDF document text
- https://pellevah.com/upload/files/24455940919.pdfIn PDF document text
- https://kurtoglumob.com/upload/file/67384206673.pdfIn PDF document text
- http://traslochimontalto.it/userfiles/files/73289238177.pdfIn PDF document text
- http://kite-surf.sk/files/50667620999.pdfIn PDF document text
- http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28732982250.pdfIn PDF document text
- https://myagenda.myagenda.cz/pictures/editor/files/pukikiwunejozufuvu.pdfIn PDF document text
- http://biosafety.biz/ckfinder/userfiles/files/61652305853.pdfIn PDF document text
- http://olech-rzeszow.pl/userfiles/file/28527806438.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_off0000e088.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE088	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f89a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF89A	16336 bytes
SHA-256: `fdd931517be1d3a2061fe32b731b93d99e44cec02abad5f5ef071736f8342ac3`
`font_02_sfnt_off00012305.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12305	10240 bytes
SHA-256: `1726199bbe4041cb185d4c451c27288b7027e492150f8f8b7adc718e331e945b`
`font_03_sfnt_off00013a06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A06	1920 bytes
SHA-256: `5215671b78cd122bb03f7d9a240504fbdb445689c9afa904ed601adbc7031b8c`

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