Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea825698efb8b79…

MALICIOUS

PDF

83.2 KB Created: 2021-08-30 16:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa6eb9b7a8a25549f9e6e64b1be50a1c SHA-1: 7ae0db257fd68742bb8128794fd12b9256fbfe16 SHA-256: dea825698efb8b791b9af5cf7ef209ae1f946c710ddf4a548cdd99a1753d93c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The PDF also features a link farm pointing to numerous external PDF files hosted on various domains, many of which are likely compromised or disposable, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lingchuanfloor.com/app/webroot/userfiles/files/67000374479.pdf In PDF document text
    • http://feldbach-tourismus.at/files/kudugiwufuvur.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210531002852.pdfIn PDF document text
    • https://noddy.nu/images/file/49443426490.pdfIn PDF document text
    • https://esvigo.com/upload/files/51230695090.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hhe81mflplful8vu0qs0fdaqml/95500832198.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/mewulinovomo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f87e60d7379aebaa51c11f77894def8e/winajebuk.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d4b8f747bbf3a0600dcccb2e739911ea/86611382489.pdfIn PDF document text
    • https://actorconseil.com/files/file/koxupigisujawesina.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4ed58a1d449c6da561108d4cc36cabc4/76378413525.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/70811718490.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/21104046492.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e8a80736---68821037009.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/96f5bab38f9d5e6ee4128fa8652e598b/guribopepimamuvijotodiv.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/64550573237.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/95012644012.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b49993d7076---bunox.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/45974687843.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608816a7d0591---lasefimomisubopad.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/56501083769.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/pelinenuj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2a8694ed6fced3e1114766bca40be028/7051019598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tibial+metaphyseal+fracture+in+adultsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 11084 bytes
SHA-256: f746c304562825d945f17ca94a39fbc368166aa954496fef19ee8a8e941a0ce7
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 17304 bytes
SHA-256: 4d0295ee6a5815b6cbe39455dc68c3f965b541daf4ad43e7556fed142d46bba9
font_02_sfnt_off000126d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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