PDF malware analysis — malicious · aa65fe670f243981

MALICIOUS

PDF

81.5 KB Created: 2021-07-16 12:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e3443c1e116f0bffe9c5c5a999d8b002 SHA-1: 83471020cfeddf49e328559276518509181bdb5c SHA-256: aa65fe670f2439815a373e7c1a84508e909fda431bcb6983b3a68b498544d515

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware hosting sites. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 http://www.css-jp.com/upfile/files/2021/06/15/30889191937.pdf In PDF document text
- http://orkoien.com/userfiles/files/vagimosupuziroz.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f6a972ee8f0981d86cdec0b508923ef/79531865451.pdfIn PDF document text
- http://gopherandsquirrelcontrol.com/admin/images/file/79674340613.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/caca0b847ebd61b0e9160b0c4f9ceb06/90247463315.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8efed090d0---jevutiwezatemoreguxe.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/m9c1rvlao8ocfvmi2cv6910gjo/pigopopeni.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f56e33aaa---52287015729.pdfIn PDF document text
- http://chinamakina.com/userfiles/file/78558870914.pdfIn PDF document text
- https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0fa4bb532108cb1637aa4607873c75ce/78053978746.pdfIn PDF document text
- http://munsusa.org/userfiles/file/20210525170200.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090fcc6be14b---zoriwadimev.pdfIn PDF document text
- http://4seasonstours.in/userfiles/file/sagobenes.pdfIn PDF document text
- http://coimbra.hu/uploads/ckfinder/userfiles/files/55540405370.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/72384183348.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fc217490fa67cf5fed8a7e2244f47204/12096350189.pdfIn PDF document text
- https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/956b5d450e73647b6fa01f5652f21fde/41143678238.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083381a91b16---kesabalunixibujetidave.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/vamatadazinapadujamuvov.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/vm2igf9jnad3ulvuf6r9j8rnk0/92064781389.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc7d0bc60549ad2530e28aaf1ca84843/77900999817.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/avrf241ouj5n8nvvcsagmgovqh/75373889046.pdfIn PDF document text
- http://bobmeetin.com/media/galleries/files/buxafog.pdfIn PDF document text
- https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609090a03271c---povanagapisirugu.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b26f0c9ab---60268262378.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=last+15+years+gate+papers+with+solutions+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_off0000d7d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7D1	17596 bytes
SHA-256: `ce85ccb74b10c4d69e295928f7542911747ba0fdd8a3aaac1913ea3eb52f3daa`
`font_01_sfnt_off00010648.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10648	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E5F	11220 bytes
SHA-256: `8483c22d7ced5879f545266d34fac22a1321513fc1948d3ef88a90a680bd095c`

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