PDF malware analysis — malicious · 814fe4ee5f79207b

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 12:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: cb3487a03915f2e17855dca4cff4b03a SHA-1: eef06dac649becc741c84b93742fcc456ceb6a25 SHA-256: 814fe4ee5f79207b50911d085ccb8e3caceb10a90d0a61779fafe3eaf9c057d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://synerhu.ru/uplcv?utm_term=after+full+movie+123 PDF link annotation
- http://hyundaihungthinh.com/uploads/images/files/logejexamowovufakumezan.pdfIn PDF document text
- https://rireenfrance.com/images/upload/files/vodelifufewuvuk.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161352cc67ff44---nuzalebadoni.pdfIn PDF document text
- http://eviljoy.com/UserFiles/File/82519548946.pdfIn PDF document text
- http://telektrans.hu/editor_up/65765489508.pdfIn PDF document text
- http://carsonpokebar.com/uploads/files/30415565568.pdfIn PDF document text
- http://jinruily.com/UploadFile/file/20210911100658726.pdfIn PDF document text
- https://digireg.gr/upload/subetofuguvebutof.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146fbeadbb04---6262072006.pdfIn PDF document text
- https://khotelmarket.com/FileData/ckfinder/files/20210910_AB1ABC67F2B208A2.pdfIn PDF document text
- http://www.mbk-montage.nl/ckfinder/userfiles/files/jidixazezesekexexuke.pdfIn PDF document text
- https://vayamcs.com/content_files/files/55624839336.pdfIn PDF document text
- http://bafiti.com/sklep/userfiles/file/demutufaxaxijusedipek.pdfIn PDF document text
- http://hongdanhaudio.com/luutru/files/54765200962.pdfIn PDF document text
- https://granitabrasive.ro/editor_up/ziratidepirirusanugawe.pdfIn PDF document text
- https://booknowrentalimo.ch/userfiles/files/38385628272.pdfIn PDF document text
- http://zuche0551.com/upload/file/besumanugowafesezi.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9e9b7ea4f7a9409ee2ca628a383ba27f/titemekavo.pdfIn PDF document text
- http://www.vishalsahni.com/public/ckfinder/userfiles/files/47454468896.pdfIn PDF document text
- http://www.museopizarra.com/ckfinder/userfiles/files/15383502293.pdfIn PDF document text
- http://jewelry-shopping-city.com/uploads/files/202109130651374741.pdfIn PDF document text
- http://elencostruzioni.it/userfiles/files/majavuwobivazufikosedimo.pdfIn PDF document text
- http://lexxyin.net/files/fckeditor/file/viwej.pdfIn PDF document text
- http://a-xian-coat.com/uploads/files/202109041536578285.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147517e092ba---40263836101.pdfIn PDF document text
- http://opt-russtd.ru/data_center/upload_pictures/file/17762586096.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_off0000d070.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD070	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e887.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE887	10432 bytes
SHA-256: `d1d83322f4ea100de22bd20e803163138b41cd6e371699b4a7741b72cbd0eab9`
`font_02_sfnt_off00010056.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10056	18224 bytes
SHA-256: `69e20a2e9267b01d062447fb94f1d2ba98ad6cfd480985d0fd67e1f99ca684ea`

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