PDF malware analysis — malicious · b409f4eef214263d

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 16:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: d9843b56cfe0d7283ba37b854a96fba0 SHA-1: b42dc93d2211d9a99583fb2acd8f69264ac2ed9c SHA-256: b409f4eef214263d69a9a5cd7f1346e6901f3defe75a032c0c7c68ee52cdf269

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/nhe8biqjvkfmlukcslgct0sjkh/93677482039.pdf In PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a2473db5995754fe7d725fca8be4caa5/dixarebikuzexipivobixeki.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b85819cea45b8a1a60148fd1ba18087c/76747154463.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60baabef22---79176959239.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/13n3i1ud2q8fhjmca8bnv939p0/91513795168.pdfIn PDF document text
- https://barcelonacentromedico.es/files/galeria/files/98865928847.pdfIn PDF document text
- http://aokisuper.com/ckfinder/userfiles/files/zomarodiremimojisexibubot.pdfIn PDF document text
- http://vivaibonomo.it/userfiles/files/51248486014.pdfIn PDF document text
- http://seventyfirstclassof69.com/clients/60772/File/58618219639.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/24628abf8806b19a9711e13f8d9d4f79/10833181347.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd1925690---5241273658.pdfIn PDF document text
- https://alternativecarrepair.nl/userfiles/file/lofevuwogudolud.pdfIn PDF document text
- https://nstoplana.rs/ckfinder/userfiles/files/27689882492.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db48ddff7f---8838427830.pdfIn PDF document text
- http://aktien-analyse.de/images/File/91249774020.pdfIn PDF document text
- https://iveducentar.com/uploads/assets/file/65188494143.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b810f5bd3b---2056252660.pdfIn PDF document text
- https://emailing-online.fr/uploads/userfiles/file/81219535325.pdfIn PDF document text
- https://didacostruzioni.it/userfiles/file/wozovamogopinijoga.pdfIn PDF document text
- http://agro-pasz.pl/ckfinder/userfiles/files/fazusatigubasikijeramifo.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92a4e8cb6---xijinoxunivi.pdfIn PDF document text
- http://bigbazar.cz/is/images/FCKeditor/File/gujuronesezimonun.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6f8903a3---waroxowitow.pdfIn PDF document text
- https://businessservicesuk.com/userfiles/file/jebododagivozebive.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/38e8752fd20234dce6bdc24713e8d671/pejubisedimupava.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=believer+alto+sax+sheet+music+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_off0000dd74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD74	11104 bytes
SHA-256: `d8c170aeff64b13efc4779a53d8abcc357f1da9c8dc153d639fd52db1f2992d2`
`font_01_sfnt_off0000f766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF766	17668 bytes
SHA-256: `f1224ae91028bbf038870fe1594a9e6d5ff82a638798c69f303c90a1afaa4823`
`font_02_sfnt_off00012521.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12521	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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