Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39750ec6eb0cb57…

MALICIOUS

PDF

100.6 KB Created: 2021-07-31 13:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51d8a99ca715a679edfd6b802f12009c SHA-1: 94dbbcc5f63c0799d8b52e402719ebbfb9a5a7a2 SHA-256: d39750ec6eb0cb570771900198bf0adc73b9633efccdf8b56340d33e64b80ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. No scripts were extracted, but the presence of numerous links on disposable or compromised hosting indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1a869b2e4---69885704799.pdf In PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d23ef92820e1a9f40a8a4b9dae290385/39858640969.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/zoveregakekoderudeduxot.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/rubixa.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/78817713586.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/dudopirabadifapovexu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a86586c2ebf---71882190230.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bemukigenudopamivuw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077678ebd0e2---zosek.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/muvazolebo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a0d13f9718a2b696813b6c44e5d6fafa/tafuvexavogobaguj.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e990761eb---18989368428.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/146842541260d62ac040dcc.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7mll7ou88nfrj83a7c1j9h1u4/39450699789.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nunirilokofabotorutos.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/dd07ov4g4c4j92453vhq068nmk/wudinotosoxi.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/xixiposorawute.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/83098736940.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a273c3594---32846458184.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/76e1e22f316760ec2fd41b24bea3deae/64573125003.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jisarimugepo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5bfbe2a5f---lutilivagenilobopiduwap.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ac85d80d2---fesutipitu.pdfIn PDF document text
    • http://fullx.net/files/fisux.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/7186889954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dr+fone+descargar+full+megaPDF 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_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 22012 bytes
SHA-256: 9e87fcb9747e7fabf3f0d32d35813475268ae8204ece97dcf1a982fa03ee7a17
font_01_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16942 10732 bytes
SHA-256: 3aeaf9ab7b9b2c3ad0e71334a6b4046ce13a6f76df6c893263c57a1c407ea439