PDF malware analysis — malicious · 9e434328a69d397c

MALICIOUS

PDF

94.6 KB Created: 2021-09-03 01:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5931eb30b10531ad0c131f9f2e471e5c SHA-1: feb3d63ab8623ebfde394298c1a9c962be8347cb SHA-256: 9e434328a69d397cccfd280f9e30afabfab44ed9b35f22da4e09e7fa81487cda

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using search engine optimization techniques to disguise the malicious intent of these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9897

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 https://inwebjor.ru/uplcv?utm_term=surah+yaseen+english+text+pdf PDF link annotation
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/07cd67cb65d3a9e961bd698578e767ca/rutakurudosexorupu.pdfIn PDF document text
- http://calisnt.com/uploads/files/9662654602.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/992b154b608a98c7d0101a5e4720134f/3796978667.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba8d6099---25977460348.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/j24ggc92gkr4bvk5n82tv09hnh/tuzamawafaduzizufalifima.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc2b4cc97---46027836805.pdfIn PDF document text
- https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/93ac2dcb2d69a9ba72db218a79175b7f/68501017449.pdfIn PDF document text
- https://bya-ingenieria.com/ckfinder/userfiles/files/99023101193.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18867413f---36068088293.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee09df36319---sojonidogadinafikipozovar.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0pr0ftd4kulqgd3mas2qm1fjmt/5991713224.pdfIn PDF document text
- http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/jibodubajaxejuximi.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16117a86556ebc---81024766979.pdfIn PDF document text
- http://gangwonbnb.com/FileData/ckfinder/files/20210603_9CA160ECCD212460.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fb8da0930---nenowumoje.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2c69d942f4a0e3702a12224cced228e1/jafod.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66a5c417f---kakixo.pdfIn PDF document text
- http://js-space.de/userfiles/file/58292603663.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/70rbrdacv08s48gcmrm114ulhs/43543573988.pdfIn PDF document text
- https://zhavezbozi.cz/data/file/murabixunu.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb5b8b5b9---wubuxu.pdfIn PDF document text
- http://gtlmarinefuel.com/userfiles/file/7246809036.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/cbe25061d08a6f21ce5b9d3e7e2c619b/749772769.pdfIn PDF document text
- http://geose.ru/userfiles/file/lilipupifu.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f6662825dbdc7c5def19efa47c7efcd9/juvetunidasagikoguv.pdfIn PDF document text
- https://apgr.eu/UserFiles/file/kinabed.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_off000101b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000119c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119C3	22492 bytes
SHA-256: `da7dcccfa7e8ba6ecb97af0ba8ee84d572b29b0daf15c09be24007fb7be43408`
`font_02_sfnt_off000152ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x152FF	11048 bytes
SHA-256: `48281efc44a6efad8ce6a4cf59710c824ad86a5fe87359ad40fe4717105e18d5`

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