PDF malware analysis — malicious · 1ad21751987356c7

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 13:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 0c66d4ce38b48452d9e2dec29a8bc8d9 SHA-1: 11301eedac413cfba433f5b5250639c10daeeba7 SHA-256: 1ad21751987356c78d0e226941d8b97eefe010e19d63bbd89e6249b6607816de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=angles+formed+by+parallel+lines+pdf PDF link annotation
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/eaa43f9d08a5e30ae81a230e7c20ef9a/28435866966.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096afbfcefb9---24596348740.pdfIn PDF document text
- http://jarosi.hu/files/file/kerakopuxivinolakefiworif.pdfIn PDF document text
- http://perfect-gallery.com/userfiles/file/muwejupi.pdfIn PDF document text
- http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/vawitutiduxopigaw.pdfIn PDF document text
- http://rajhansnursery.com/userfiles/file/93822836123.pdfIn PDF document text
- http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rewodo.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fde5d464d05bc11ea19d865740a6bd2c/79820450850.pdfIn PDF document text
- https://inprovit.com/ckfinder/userfiles/files/xotiluril.pdfIn PDF document text
- https://burgas-remonti.com/userfiles/file/63548411873.pdfIn PDF document text
- http://geomanteia.com/userfiles/files/35226839334.pdfIn PDF document text
- https://mttrasportisrl.it/dati/upload/file/rularamo.pdfIn PDF document text
- http://hotelsandmartin.cz/files/file/vesusibinovi.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b182c5a9---kulesonebonunijovugowaxux.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/7007703043.pdfIn PDF document text
- http://dentistturkey.com/image/files/tusowigufoxoxarazutogu.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0f8e29dcad578e6d94914009e19ad9b5/6972888056.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39a5596c6---3982175464.pdfIn PDF document text
- http://bnblspecialities.com/userfiles/files/18596423648.pdfIn PDF document text
- https://exihomes.com/userfiles/files/legagagivafevimofivi.pdfIn PDF document text
- http://posekatzahradu.cz/files/file/93013596638.pdfIn PDF document text
- https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e733dcb517a730e383c5caeff4aecc5a/xokajozutadidekuruki.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1e7b9260018a48b778c802bb6f5bfa44/bazuti.pdfIn PDF document text
- https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3358ad9974fd39075426bd24e6bd7d64/11715973360.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/fugapuwov.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_off0000dbcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBCB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f3e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E2	10980 bytes
SHA-256: `de78b4c9be13e2273ce659932641bcf5031f724a4759ea1683ffb0bea8603362`
`font_02_sfnt_off00010cea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CEA	18324 bytes
SHA-256: `23016b0fba8397121883fd36ea58d5919d07990ba0f48dc864bc48e362c0e919`

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