Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e4baf4086f8513…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 13:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd8799f8c26c8054938191458c2d536f SHA-1: 7162228f5658a5f5b51b8e3198f602e838c9846b SHA-256: a9e4baf4086f8513269c9d1507fe40917d384225e8db784f62f9d7f25190cba0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a malicious link farm designed to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=tiger+woods+iron+lofts PDF link annotation
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/66916087447.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f228bf8a341a6e201a0b6bc1c8d7285d/12084074580.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bfb9e7dda02596decb9f28eed0ae8459/75216939549.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/nafatir.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/24283639715.pdfIn PDF document text
    • http://belniig.by/public/file/xubinerolumema.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/wowonixowulif.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/kenenexo.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/396590086612f9abf90c9b.pdfIn PDF document text
    • http://strandedtattoo.net/file/17440920452.pdfIn PDF document text
    • http://flomojapan.com/upload/files/75543011732.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/67395862986.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/70e8691664bc258ab4598b1386dfebeb/pirovabuvifafo.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gudoxojif.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/45752463047.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///gitedukanaroxodot.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/2450980592.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/tesagezewekerokotedab.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/10/64880485557.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/pogatizoxobumemupu.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/dogetideponunetes.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9261btptn42v2jhj038mjts906/pasalaziverimeze.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.

FilenameKindSourceSize
font_00_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 16568 bytes
SHA-256: f3ee31446eb934c3899c49be85abf0b08d643c1657709cb4d9315263b6e4d010
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 10416 bytes
SHA-256: 3ef1352eaedbd6ef58b21b3924e6a4e3757271a3c6ec2ecc70d502d5c05b765c

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