PDF malware analysis — malicious · 785eb59ca7a11c56

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 17:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 3045fc7b0b4fe8a234961945f6e9111e SHA-1: f71c0d927276ee11e938a341559225a08c37d914 SHA-256: 785eb59ca7a11c56de4f0af764d245dd4ea1b2bf3241683b0b5d82bc6854d83c

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, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic flagging of a link farm on disposable hosting further support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://crewmak.ru/uplcv?utm_term=rendered+null+and+void PDF link annotation
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f4db2307b387003f2be08680a33da810/73454308179.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a0c39ef6---tafomulobubukijo.pdfIn PDF document text
- http://bainihu.com/upfiles/editor/files/84767462210.pdfIn PDF document text
- https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/h34q67hq6kdr59bil7okijbhje/fonesexapuw.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3d9c8d74---luberopupemosevepex.pdfIn PDF document text
- http://nessium.fr/userfiles/file/8892019616.pdfIn PDF document text
- https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7f727127fa520e568224e58dc3b73923/tojurututuvenisibez.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5998ba92d132075e39100c1dc278450c/82346296176.pdfIn PDF document text
- http://pospatrans.cz/UserFiles/File/foxezojosubage.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/49063046235.pdfIn PDF document text
- https://daxitrip.com/basefile/daxitripcom/files/61715977244.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56dba3e7d---kulosobisevojodikifevitag.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/bimivuvateromo.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfd0634d6---48926065261.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a399c3a9c---merufukefufubito.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee7883522---50344291990.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2423e209b2---62329322507.pdfIn PDF document text
- http://bsbcarpet.com/userfiles/file/87052515355.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eecd5db152---50982027607.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609963f3e8cf9---84941985220.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/fofasifarubiza.pdfIn PDF document text
- http://co-wemart.com/careeruserfiles/file/77456084587.pdfIn PDF document text
- http://clubselectionvoyages.com/images/file/marifakedegexenug.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed51de9fc---pazimuwofezemuvafuriliru.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8c37b4d8bd865b1cc520e9a5ba135c0d/vibosusiduputagaren.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cd87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e59e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE59E	10184 bytes
SHA-256: `80f0796ad8a45c586ed269826fe2e7839fa1924512ca87db62282592e4b8eca0`
`font_02_sfnt_off0000fc76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC76	9696 bytes
SHA-256: `ba2cf72fc6c36912b2b1e87f0ff17117362240fc09d30a932fbf30561f07a04c`
`font_03_sfnt_off00011ac2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AC2	17096 bytes
SHA-256: `b2fdab819a4312dad067dfc22224b1acca28e81c70bc88c93891071ab0f6d2cd`

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