PDF malware analysis — malicious · 86b2b7d9c35bf3d2

MALICIOUS

PDF

88.4 KB Created: 2021-07-31 14:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8204df93a8b4a8f552a3c2f33b7a9b1d SHA-1: 55a27fc02357b8563a7982cf9355577be47d8eb9 SHA-256: 86b2b7d9c35bf3d2cb06de359db2c6d442a4ab5e6dff167b431c66f36904820d

204 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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests this PDF might be part of a multi-stage attack where the actual payload is encrypted and requires a password provided separately.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://huntic.ru/uplcv?utm_term=comment+faire+un+faux+virus+matrix PDF link annotation
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608175b63bd8c---fujokedig.pdfIn PDF document text
- http://albatrossmrn.com/konadnew/userfiles/file/wiforexat.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77c33d09---kexupovit.pdfIn PDF document text
- http://mp-journal.com/media/file/2357081275.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35e91567f---lijuw.pdfIn PDF document text
- https://btegypt.com/file/natoloz.pdfIn PDF document text
- http://trekkingsapatours.com/upload/files/23809054326.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8fe806987---wonepetiwivebug.pdfIn PDF document text
- http://www.lebedosapartotel.com/data/yukle/files/8912684094.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7241feffc687c85bb11c29b20743af6b/12628142849.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/47fb3afbbdad5454e9e2613e418d9419/niwiwukunuku.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/76468c776ca60cb41627f375bdb629fe/81307932310.pdfIn PDF document text
- http://lubrifianti-auto.ro/files/file/gilenaru.pdfIn PDF document text
- http://kfnmsz.com/upfolder/e/files/20210725222556.pdfIn PDF document text
- http://www.patriarca-batiment.com/ressource/site-image/files/tumogawi.pdfIn PDF document text
- https://infiniteprospects.com/FCKeditor/file/ridoluse.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b8194da5da928e6900364a481796929/88910038499.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cd9b83d1bbbaf49256f7860ad633c1ae/zinusimib.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01513b9fea---poxitusajagutiziped.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b45cbda8f---wexul.pdfIn PDF document text
- http://www.elmundodelapiscina.com/ckfinder/userfiles/files/baxuvenoxejojafazusa.pdfIn PDF document text
- http://cateringkieuan.com/uploads/userfiles/file/taxixodawitokaw.pdfIn PDF document text
- http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/kajurivozakipurazufik.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e49cb443---72391895759.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe7e3407eb---13845891374.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078159e028d3---lapatadozixeloxev.pdfIn PDF document text
- https://0900107678.com/upload/file/16491130756.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/426000e0bc499168b9b92c01d8ac4d00/jinejoto.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_off0000eeb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEB6	19756 bytes
SHA-256: `9e41fc9e15c4654c54d0438024ff1451206352f51b0b53bd3b89792a3aeca647`
`font_01_sfnt_off000120fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120FE	10628 bytes
SHA-256: `02d0e8163b2d2629d7678c39f7cb2fc34f26ea18a30b4424aa370e633144ab2e`
`font_02_sfnt_off0001396b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1396B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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