PDF malware analysis — malicious · 45665a72df16528e

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 00:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 481618b9b5cde7d88e83c30915544f98 SHA-1: c1515ae34d263255fffc8e4a33d26c380f385f3d SHA-256: 45665a72df16528e1b4a0a0045d3d236ee3fa1a8f9ff7ffbb5d869d2d6d8cbf5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. ClamAV detection further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://cructi.ru/uplcv?utm_term=pdf+change+font+size+in+textbox PDF link annotation
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f930296bf---55070106117.pdfIn PDF document text
- http://mpu-beratung-brendle.de/userfiles/file/86884032238.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f720fc4f---wekovogefinipo.pdfIn PDF document text
- https://capital-tic.com/upload/ckfinder_temp/files/20210605021759.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bb1g7t0vbdf29e6vk6chhvmvq7/jalogaboxesewijo.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631eed7f04---musabivitelaxob.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c78d29848---30375084997.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r3uk6muvkpi2th1ktemdpj27c0/27767118438.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/a9c7rinll4ktvvumpc95drsooi/71983721837.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d40515daa62f788050fe77aace0e9f11/69459532334.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcb2b1296---14611404317.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e149b102d094846df3ddecbdea2a8d29/70554206998.pdfIn PDF document text
- http://webinaris.biz/ckfinder/userfiles/publics/files/saxubixig.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8d8564d9---gelaluzapumarafov.pdfIn PDF document text
- http://auchli-appenzeller.ch/userfiles/files/43841243255.pdfIn PDF document text
- http://forter.vn/hinhanh/file/56716992179.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf7ffae121---25778508034.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f93decee3---74334915927.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/16cc6f6f32e552a553c52c5b03616a2a/zadut.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63693bfa70---mifaselefatofinubuvazemu.pdfIn PDF document text
- https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8c73e975977b1a203caf4ed833a8b1f7/taforenawakufonewubojaxo.pdfIn PDF document text
- https://ssmavidiyar.com/public/content-images/files/81054244027.pdfIn PDF document text
- http://garderoba.sk/images/_file/basonufijopedosavani.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/nmjrn23a1r589im6v0n5mld85d/rasamerokupelexezalokug.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/01mdcl7vahajsg3ok8bq5nb2uq/suwarapuxiwoxaguxugitot.pdfIn PDF document text
- http://akicgiyim.com/userfiles/file/nawapijujobugegok.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091c33ca09d7---33369234960.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_off0000ff2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF2D	17560 bytes
SHA-256: `335b76dc942484b27d0cabd431c9b5e1273581c5ae2eb802f5f64ca317d78573`
`font_01_sfnt_off00012c90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C90	10912 bytes
SHA-256: `c1b4b761c40e9a009c774a5f4b48ebcca552bfc8687e3c6f0b906ebb4a5f3112`
`font_02_sfnt_off000145a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x145A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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