PDF malware analysis — malicious · de957ef716491af9

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 22:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: e8a824bfd0de4761a1a35f5f7525e97f SHA-1: a7323b9e53d5405611e6e0cdaef8d708824c1cf8 SHA-256: de957ef716491af9b36fee35e3d93284c9c37d7abe28ed09756440df9796b811

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. No scripts were extracted, but the sheer volume of suspicious links indicates a malicious intent to manipulate search engine results or distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=second+largest+animal+in+the+world PDF link annotation
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9cg4dsfjoo0gu3mbkedkrkm9kj/zololedaxunerotutixarusi.pdfIn PDF document text
- http://driscollandgibson.com/images/edit_images/file/20929669503.pdfIn PDF document text
- https://turbooto.vn/upload/files/62090799389.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/51086931694.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cec8c282f46814c91d7f6f80bf4b0a96/lerexemigepuxupiguj.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081813f46d1b---zufusisububalobafisupu.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a321f5af8cc---fugozoraneturexa.pdfIn PDF document text
- https://amursvoidom.ru/media/files/pibezaponunugakim.pdfIn PDF document text
- https://optimuselearningschool.com/learning/site/images/uploadfiles/tunatekekekitemizikava.pdfIn PDF document text
- http://mt-filtration.com/uploaded/file/38424277760b84e9b1acb0.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/54387187851.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609650a9e9cc7---jataveromananazamunebalup.pdfIn PDF document text
- https://tongdaidoanhnghiep.com/app/webroot/upload/files/24316382128.pdfIn PDF document text
- http://brianhaymore.com/images/e/file/mananawukos.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/210f583fb2f70b63d24537ab3869fdcb/66690440684.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/0ee816a83860a3776fb04b81e497a151/8931302387.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c7365eee52105a10bb3981ab2d96dc50/fupetarixox.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/24001facdce56064d455f5c2c8fabc23/5496805834.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e0fc80a34d3b4fabe605de1c07df44a7/54844588613.pdfIn PDF document text
- http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/3214512798.pdfIn PDF document text
- http://greatnice.club/updatefiles/file/pibanazawezipuwurak.pdfIn PDF document text
- http://119hero.kr/userData/board/file/rotufirit.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/masixur.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_off0000f4f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4F6	16788 bytes
SHA-256: `23a9086f568b3a57e4b5d05c2c6ea9ecc6559299983763324ce99175c03f3d4f`
`font_01_sfnt_off00012083.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12083	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001389a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1389A	10980 bytes
SHA-256: `19864ae23aff22938fedad116ef7c7c27922512447ed7a1f61527d4a37e62116`

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