PDF malware analysis — malicious · 39ef6a6ff25a018d

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 04:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8a28cece1444ab9073d6196068953a30 SHA-1: d267a68b0776022c8382449bc16e1c05b4527c77 SHA-256: 39ef6a6ff25a018dcd6b76731dd78df8ced4fc8b07c5aca5ae8d6d8da073bb74

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://mosallaesf.ir/uploads/ck/files/wibiwos.pdf In PDF document text
- http://raffaelecavazzoni.com/userfiles/files/19596840930.pdfIn PDF document text
- https://arichaindia.com/userfiles/file/84697924556.pdfIn PDF document text
- http://austria-ex.com/images/blog//file/47069164567.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6b4d23aa4371c5aaaeab95bcd0ffc8c2/8065705315.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb5682dd0---21169682390.pdfIn PDF document text
- http://funperm.ru/content/file/85914702721.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2c01adc5041c2bb7db934539c7212b8e/90515248730.pdfIn PDF document text
- https://addsfly.com/userfiles/file/58679120537.pdfIn PDF document text
- https://askisan.com/upload/ckfinder/files/51479748369.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b69686af1ae361341ff6666e2213c02e/pozaduxepede.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a396aa4f---44838446435.pdfIn PDF document text
- http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/figidifalalasubemuju.pdfIn PDF document text
- https://sportsht.com/userfiles/file/zewikavugo.pdfIn PDF document text
- https://komunalno.vrgorac.hr/files/53873801551.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/74844984ddf23d015d2a5889a2c810db/38239809099.pdfIn PDF document text
- http://cloverdiamond.com/file/12146088845.pdfIn PDF document text
- http://polimak.pl/userfiles/file/74049511953.pdfIn PDF document text
- http://defhjdr.friend-match.com/upload/files/pobaxapo.pdfIn PDF document text
- https://istanajp.com/contents/files/51961506580.pdfIn PDF document text
- http://thepnguyentran.com/media/ftp/file/wojudozanefuwulajuvov.pdfIn PDF document text
- http://ciarajewellery.com/editor_upload/file/46984354861.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/117ece0e796cb72f1a4a59fd6e44ed3e/duxegidog.pdfIn PDF document text
- http://sure2trips.com/bot/ckfinder/uf/files/bazozoxerewikeranoxux.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e49f84c132e492c33bd2d708a917db1e/62281246858.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefce2a632---vaxuluk.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/rovuretobapolemag.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=livro+gram%C3%A1tica+normativa+da+l%C3%ADngua+portuguesa+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_off0000d2d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2D5	20304 bytes
SHA-256: `c778fb91ec2a49d9365fe14156e415f50143ae70a0509afcb37a6065702d3072`
`font_01_sfnt_off00010543.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10543	11328 bytes
SHA-256: `2d2118e76e5e670227bc12c132584f7937daff46ad113d61d3b5b9f27591b092`
`font_02_sfnt_off00011f51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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