PDF malware analysis — malicious · 384f31f4ee291d95

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 15:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f1f0c13d54ccb459fc37ecc62a63b621 SHA-1: e8c6f0efd0eddc286e7d14db0039f1a43fd346b8 SHA-256: 384f31f4ee291d950e2ae9a6d96db4e2a41de4a9726a8fad96eccd264d16f9bb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=clash+of+clans+ios+requirements PDF link annotation
- http://zgic.ru/!upload/files/xakowavifule.pdfIn PDF document text
- https://abandassociates.com/ckfinder/userfiles/files/voxeropol.pdfIn PDF document text
- http://brava-ekb.ru/userfiles/file/regedefawiserixapovekozab.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614029764263a---1171525864.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e522506d06---pepejafufafimaju.pdfIn PDF document text
- http://thenikharvconsultancy.com/userfiles/file/wukawimuzag.pdfIn PDF document text
- http://lindseyderence.com/userfiles/files/51817019097.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e7cf21f6d7babbece3a7b99aff5c923a/jezowuve.pdfIn PDF document text
- https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/75931976318.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/99ba459ff7ba76c2711880fc0e7292f1/zuzezowo.pdfIn PDF document text
- https://aquatrustfina.com/userfiles/file/wakage.pdfIn PDF document text
- http://traiteur-ribot.fr/userfiles/file/komurapiporijamagenujuva.pdfIn PDF document text
- http://anbao.vn/uploads/userfiles/file/4553305100.pdfIn PDF document text
- http://njchemland.com/upload/files/26804120792.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161442e7ddb7b5---23703154579.pdfIn PDF document text
- http://flygarfield.net/userfiles/file/xoboxewukoba.pdfIn PDF document text
- http://tuyothuyluc.vn/webroot/img/files/10445578002.pdfIn PDF document text
- http://broadviewlibrary.org/uploaded_bvlib/file/16349474383.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e3594de7a77d0a700ceef9129a3e2fe1/10687885307.pdfIn PDF document text
- http://bawaconstructions.com/editorData/file/wenudowiselef.pdfIn PDF document text
- https://broadcasthub.com/ci/userfiles/files/3678287908.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3pl618cm8j2d9asqkgd492pe8m/6687118796.pdfIn PDF document text
- http://saatgaamkansarasamaj.com/admin/uploads/files/gozupuzizizul.pdfIn PDF document text
- http://klawiatury-foliowe.pl/_data/file/ribam.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_off0000b372.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB372	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cb84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB84	16172 bytes
SHA-256: `8393d594c8a41b895444b1e6f2ca0ad845fe50c4e3d899cb0b9913b68c3e948d`
`font_02_sfnt_off0000f433.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF433	10880 bytes
SHA-256: `aac944136fd444ddec387d97ae8152bdb1cce6f409fded3b8e7848ffd8824fce`

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