PDF malware analysis — malicious · decb5ef4219f252b

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 10:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 73ac898f4e18a24612a2598b0ab3b13d SHA-1: 08b03f725dcd33a725d7aed6a55ce1353ed3e2ba SHA-256: decb5ef4219f252b113afd2283e616243e47d922fcedc0c2b87100addbeceb78

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at driving traffic to potentially malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=translate+chrome+page+extension PDF link annotation
- https://sieuviet.net/webroot/img/files/4392020998.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/db76de1fd1fc8686b4b55431e16cd8fd/sobeposumadevafopiva.pdfIn PDF document text
- http://cl-pub.com/files/files/gaxulusoxelo.pdfIn PDF document text
- https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/86454455942.pdfIn PDF document text
- http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/werifaruz.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161181ec6a311d---nelobogisafe.pdfIn PDF document text
- http://vikohasanfiber.com/upload/files/59885637427.pdfIn PDF document text
- http://marinaxaraes.com.br/ckfinder/userfiles/files/kupegabidolubazowavuboga.pdfIn PDF document text
- https://barcelonamedicalcenter.com/files/galeria/files/61142024161.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecc34e84a---fepevibuzugesumilegubutu.pdfIn PDF document text
- https://htlexpress.com/ckfinder/userfiles/files/lijugurure.pdfIn PDF document text
- https://bistakalikotenetwork.com/userfiles/file/62317055552.pdfIn PDF document text
- http://thebankcardservices.com/uploads/files/2381732894.pdfIn PDF document text
- https://hawkseyetravels.com/assets/ckfinder/userfiles/files/mabukaparewadej.pdfIn PDF document text
- http://www.corazondelsol.es/ckfinder/userfiles/files/6777705794.pdfIn PDF document text
- http://netinflux.net/userfiles/file/piresuluwofalajugo.pdfIn PDF document text
- http://tinavaron.com/ckfinder/userfiles/files/51793888424.pdfIn PDF document text
- http://dok-vo.ru/userfiles/file/vijamojufigesimusowoz.pdfIn PDF document text
- http://dominopark.pl/public/upload/ckfinder//userfiles/files/tuwezifitom.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecd1675fd---supakotujo.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f5d86aee309d28e1a4daaed1ce4823c2/dizakevipivarajufamiv.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d8623b1928---43691206385.pdfIn PDF document text
- https://baglab.pl/galeria/file/genato.pdfIn PDF document text
- http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/8608593913.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_off0000d793.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD793	17644 bytes
SHA-256: `b7705f0ec68babc7dff9be3c51b61fca7fd02ea838a66564a864f4c539692617`
`font_01_sfnt_off00010566.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10566	10888 bytes
SHA-256: `5d9187dde1f05528a658424cc7320e32e8701e55c1bad68eb7e7919f3b163830`
`font_02_sfnt_off00011e6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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