PDF malware analysis — malicious · ec35d082319d81ce

MALICIOUS

PDF

74.0 KB Created: 2021-08-04 04:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 69f6957ca74fd5b63a97ce946745b2b7 SHA-1: 96268df6d211849778b6953a9347279a7842c679 SHA-256: ec35d082319d81ce382486338f088bdbf59ff6906990c393ccaf0f3df9446a7a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=bhakti+gana+dj+song+download PDF link annotation
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a293a0df78---fopoxiruluboxatapijek.pdfIn PDF document text
- http://bscsaoner.in/ckfinder/userfiles/files/3695737683.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9lhk9ca7kbbjh07imjhd518roc/nitegekizulawomofozilo.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c63fded47---54423995305.pdfIn PDF document text
- https://limblength-sldf.com/userfiles/file/muvir.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bcb4c7112353d57e0eafb8e3fdffc430/pimakopojan.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007c05de6e3---69096977355.pdfIn PDF document text
- http://illinoislivestock.org/userfiles/file/5633451557.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9ab86dbd5d2d80a7687be83298fca82d/bulikewoxibabesinibelu.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8d895985---milejazo.pdfIn PDF document text
- http://eurekaelearning.com/upload/news/file/gevodazovivi.pdfIn PDF document text
- https://iphonerepairservice.nl/app/webroot/files/userfiles/files/68806619409.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5683a18ad7---2445798965.pdfIn PDF document text
- http://bannails.com/fckeditor_userfiles/file/87886082846.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe37960c45---virezaneroz.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v9a1as182gl69fi4c6t791ertb/tudedixixivisasitubo.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ead8d736a0f46a031ad1cdfbee7d9ca0/fagepowifotufox.pdfIn PDF document text
- http://gursakaryahukuk.com/images/file/megudoworof.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b42ac0fe---41764011242.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7258fc49c63568c782531b0be90b7855/50204885975.pdfIn PDF document text
- https://x-software.cz/data/file/mekoxowawozo.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca59ad3d58---71013390076.pdfIn PDF document text
- http://kientrucsangtrong.com/plus/files/82075478813.pdfIn PDF document text
- https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3d0b64cf9016dece678a64d5a89d6e03/nadikinegig.pdfIn PDF document text
- http://55pluscommunityspecialist.com/userfiles/files/924025951.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_off0000bfb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBFB0	10656 bytes
SHA-256: `ef9843fac98d95b22ee6fd77ed96faae413f1931cc81fa542a94f7e6f04d5fee`
`font_01_sfnt_off0000d7df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7DF	16056 bytes
SHA-256: `c940fe1ac21c1b45f4b4f380ebfbb0c1dbc22daa3051dbec1e7541655d2bdaa4`
`font_02_sfnt_off00010191.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10191	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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