PDF malware analysis — malicious · f45616ab58d3a0d7

MALICIOUS

PDF

89.7 KB Created: 2021-09-06 01:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 902bd5fd95ce52ffdcaeb87b384330d1 SHA-1: 8ad9cd730ed3ad83fe168502809a3f3109f0d05d SHA-256: f45616ab58d3a0d76ef0d707906eaab35440e1da964fe3ddf0be8cbeee476d40

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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 compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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=natura+revista+pdf PDF link annotation
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/22p5j7ehcsrfo2a0fb8g7af7iu/zifuzumuwejezewateb.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fcda48986---62000842285.pdfIn PDF document text
- http://maxidmum.com/images/upload/fck/file/86519528476.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7dda957d23b986d874d9ac74c15fd8c8/79967524776.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309586613a7---41774461843.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b05383fff---11920938307.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843d2aa8b80---fonivonavojozive.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8e7f23957---kururesugededojov.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dol8r1go7fen2g31slo119i6i9/14896748559.pdfIn PDF document text
- http://metabolit.ru/files/file/38826104692.pdfIn PDF document text
- https://ubranni.com/uploader/files/16879690623.pdfIn PDF document text
- http://xn--oy2b19v1mb1yi.com/userfiles/file/90360609246.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fb3fc780e0300c4b34248bcd2dbc1a72/gibokikonuzogunivagetuz.pdfIn PDF document text
- http://sofia-es.tokyo/yamituki-n/uploads/files/59012687712.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/55ec1813e5c09bccf4ffb1e85c91f246/fazabofemazapol.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/60f975457b4d5527e235d6a07af8291c/12566177786.pdfIn PDF document text
- http://velisend.ru/photos/file/sabatipalirotok.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/c8jmmpqajm0sthikjjmr28sdb8/18524737852.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/52083389745.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/74p6b93gkbthi1m2jmfhlc8vs3/peradobawobagoxetotafe.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10851c4ba---jiwonuwalunow.pdfIn PDF document text
- https://quatden.vn/webroot/img/files/71746298901.pdfIn PDF document text
- http://globeksa.com/ckfinder/userfiles/files/37047932895.pdfIn PDF document text
- https://lawina-radom.pl/files/file/zefaxevajowepeviwawugom.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/52ef76d3b66e3466349908d76683fe2e/fovafunalanadivopudo.pdfIn PDF document text
- http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/50323803428.pdfIn PDF document text
- http://deauville.ru/files/file/59282215699.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_off0000f594.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF594	19740 bytes
SHA-256: `0ea2415029b58e8a635e35019908c3fc2c5d17a3e32d0926bc6d5467647e391e`
`font_01_sfnt_off00012931.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12931	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014148.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14148	10364 bytes
SHA-256: `9b4297286ded01a39f2b26757eae1db5a24ad90ad3decd1d2cce5d4382791802`

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