Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5c5f57f373581f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 19:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8b791ac186245439009cc4e4f209db9 SHA-1: bf903df22ad76dbfff8ad8fe8bad48020fc771bb SHA-256: dd5c5f57f373581f91f47e9901266601853bffa6b0b02149a1afe8eec7a98724
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, potentially leading to further malicious content or exploits. The presence of URLs pointing to compromised CMS uploads and disposable hosting reinforces the phishing and malicious download lure. Although no scripts were explicitly extracted, the PDF structure and associated URLs suggest it is designed to trick users into downloading a payload, likely disguised as a legal document or invoice.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kvzriu.org/images/file/8602767602.pdf In PDF document text
    • http://shinies.ru/img/lib/file/9660261038.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/xukuvumifulodudafarosomuv.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4347bea4d868f9589210ac4a2fcbb664/zajefosasorovobupubexex.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/suvefopa.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/70608805548.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f8e66ef08bd04a5da132807aab5da135/jinidadanonesawarepi.pdfIn PDF document text
    • http://hexindechem.com/upload/files/87871718566.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/41589127781.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210825_DA75F70DB723FF7F.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae76b5d2a---99448401457.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dovunesujepewupopu.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210801_DA569829E7D298F3.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077693a76ff2---56860876427.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/vejutivewajomafomigob.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6991c25453273029a58d543c58224625/57583541613.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6151a12958c610f94379b9acdbce126f/ruzovatogaxuwokupop.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/14297767638.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/61306843074.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/65283424013.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/554931554.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/luvazisozesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=california+3+day+notice+to+pay+or+quit+form+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 11176 bytes
SHA-256: 2aa6b4b9f5a23c19e54a7932b5ee89f80c82c9296baf0bc11a73d5706b14cffa
font_02_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 17908 bytes
SHA-256: cd9feccb7fd8c8550d15ea212f534491f783fd0ccf9434a4ea80fac5bf7d7609

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