PDF malware analysis — malicious · 1f1f6d4e80939d9d

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 12:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ea6c82eae2200802323478c819d4f2ef SHA-1: 9fedbebbf4c37f2d4da3872fb9f2989fbc819f1d SHA-256: 1f1f6d4e80939d9db763db6f667d239dbcccab81f9bd3d73c851e1631e92e0b5

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or exploitation, while the link farm strategy aims to obscure the ultimate destination and potentially distribute malware or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://pixomot.ru/uplcv?utm_term=tensiometro+manual+precio PDF link annotation
- http://reopen911.info/media/file/zuvinud.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4bcb013776823886763d41d83d93c53a/tonodexe.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/407d9703eb58d49383cf7562dd40e78e/33438492449.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16080240827bd5---17121685713.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075afdb7d4cc---88851918789.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vgi9laegcrebt1h14utnnodbtg/vorib.pdfIn PDF document text
- http://enkepharma.com/upload/files/50727949546.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160860b9a48d75---13093129891.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/kajevefenaz.pdfIn PDF document text
- https://glaze-metalart.com/upload/files/4131776382.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ed7da348---tovalezezisubazamix.pdfIn PDF document text
- http://park-seversk.ru/other/js/ckfinder/userfiles/files/31203077903.pdfIn PDF document text
- http://msamerica.net/clients/873634/File/4542160346.pdfIn PDF document text
- https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/tk0avc3t5sk7mhdanbgv1hhgi5/vatexusofolor.pdfIn PDF document text
- https://pharmnet.cz/ckfiles/files/files/39479945750.pdfIn PDF document text
- https://alixdemassy.fr/userfiles/file/zusowefarav.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///fapitoru.pdfIn PDF document text
- http://wienbildarchiv.com/upload_files/files/morum.pdfIn PDF document text
- https://summit-christian-academy.net/scauserfiles/files/90055524372.pdfIn PDF document text
- https://tenshinorchids.com/FCKeditor_upload/file/5203709094.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fca9b802---77416686491.pdfIn PDF document text
- https://jdlpartnerss.com/userfiles/file/jaxowi.pdfIn PDF document text
- http://sumbulefendiegitimvakfi.com/resimler/files/pulumuxezosafudilexulesad.pdfIn PDF document text
- https://insolite.lu/img/userfiles/files/72505411817.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2fd8dcee7---ganavelumoripaturabifuzo.pdfIn PDF document text
- http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jatogowi.pdfIn PDF document text
- http://elistaprezentow.pl/userfiles/file/70140858833.pdfIn PDF document text
- http://archetipoingegneria.it/userfiles/files/63137919062.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_off0000f11f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF11F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010936.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10936	10600 bytes
SHA-256: `b86526f9303009aa30b854b2259d64231e84b2cbd83b5cfbe226f1b03dd31c7e`
`font_02_sfnt_off0001216a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1216A	18052 bytes
SHA-256: `d6100674d136245e98fe1d577783a2e09ad23e5cd24ec5e3eb6082a4f70e926a`

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