Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5f5a04503110f8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 00:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b90dc72c33210e69d1fd05d87c1e694 SHA-1: eac756c770067536ec5ac185a73768796a64a9d2 SHA-256: 7e5f5a04503110f89a6a2645d351de4a7442e4d3a3648b9ecddb9c165971ee95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://onderdurdu.com/upload/ckfinder/files/wiluwomujopizad.pdf In PDF document text
    • http://beauty214.com/uploads/files/202109040646467371.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/39670970068.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/98287590435.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/136200037613fc847caa57.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130319515dc5---29937795914.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/nixuxowetajuk.pdfIn PDF document text
    • http://pk.mo/userfiles/file/3846329016.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/dewipedulilinamaloxa.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/79656515369.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305494ef983---wasaginubegasij.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343f0940679---defivenixowaza.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/76912557750.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/91716898704.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/94090389279.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/28810743516.pdfIn PDF document text
    • http://autovoda.ru/upload/files/zarizukozijigusonovegi.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/12914502270.pdfIn PDF document text
    • https://hoavily.com/uploads/files/10566956364.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/95659061108.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/vivob.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328ed273bc9---tolabigem.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/823012274.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/19705466194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=app+alexa+windowsPDF 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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 17276 bytes
SHA-256: 36a86ea8af555313672d66f17ed81b833696785e94ecd8ca7cd6418b455a84be
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 10356 bytes
SHA-256: a5cdffc5ac6ed6668824ed5f13c59de28d7567453a656c1b7020bef12fa4cc9f

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