PDF malware analysis — malicious · 14d0856985f3f225

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 05:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: bce91de8976fec42908a1211c1486bd4 SHA-1: 9cbff1ddec3c0a83d67fbe9ff10acf58ca7bda21 SHA-256: 14d0856985f3f225f1550e0b548ef79a79baf87f79af9f14c44ad22787c79589

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for initiating malicious actions. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

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.
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 http://savvyais.com/userfiles/file/dafizok.pdf In PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081c503c1c9f---1514955811.pdfIn PDF document text
- https://braus.uz/images/shared/file/61996509290.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/44659487094.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa57d51c9a---150724931.pdfIn PDF document text
- http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/dinovug.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a7e341169---lukunivon.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fb017a8350b394a9034f9ae30ef62ca5/21223877890.pdfIn PDF document text
- https://ihappywash.com/uploads//files/202108121253184061.pdfIn PDF document text
- https://allcreaturesinc.com/files/files/87310342465.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f0f045a6dc2f51ef477a9b68f94d29dc/gukilimi.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3485944e3d9e8b749c43e4b4dbdf78e0/sonujubuk.pdfIn PDF document text
- https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/zutuporasidowukujoselam.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/jtvkg6p3r614mmp0pkdvjamsnj/jotev.pdfIn PDF document text
- https://olgunbey.com/upload/ckfinder/files/93554759442.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2d6bf0ad---26245762921.pdfIn PDF document text
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a770aa0a---68833700685.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/38b24b9217bafd97b798542721313c84/93352302748.pdfIn PDF document text
- http://bluecars.pl/userfiles/file/9089200225.pdfIn PDF document text
- https://ymvii.com/admin/upload/files/vemafuzavi.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b848be8dd4---tepewu.pdfIn PDF document text
- https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/i919fj7li77guq28tkp5lfkg7s/40297473365.pdfIn PDF document text
- http://cnkls.com/userfiles/file/1625788078.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7c39480617161864dba56d817c4bead1/pujetovofolilejon.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=physicochemical+principles+of+pharmacy+6th+edition+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_off0000c915.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC915	11168 bytes
SHA-256: `823912296bad8d08e657262da4d02ab0f6ea0dc1e4888e8a2a6647edc93c5ba5`
`font_01_sfnt_off0000e304.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE304	18532 bytes
SHA-256: `6d3df0a41fade0ec4229f464bc2b8115ee09010cc60dfc8c27f88296f5fa97ba`
`font_02_sfnt_off0001111f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1111F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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