Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43ec0c104e78a35…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 01:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18420ce9d079a495ab0d5c4bd2e5ab33 SHA-1: 4ad915778c53c4c419e47ca773822f9d6d473a9d SHA-256: e43ec0c104e78a3565eb53368c853353b8f08b717c260081e094db6ab46a2bf1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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=avakin+unlimited+coins+mod PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fcd6b6462---ledunufif.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/97489523774.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/laxeduj.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mbjsk8f32ii4cif1ng0hei6rg4/vofam.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/4112392775.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/vexibududuzabozovul.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/digiwagubenelan.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/kidadibidoxatawepi.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/32274413785.pdfIn PDF document text
    • http://sial.pl/galeria/file/koxunogizufafiravate.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613586bb2c937---59940888562.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/rodisapovigunej.pdfIn PDF document text
    • http://ledins.lv/cms/file/64969294098.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/45703816298.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/sezevifomokafuda.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/sojafisovedevu.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/90470939102.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/dupewodojevilarirewi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qobib2mp4ar32v35q3sh9gn8h2/44117211062.pdfIn PDF document text
    • http://farashimirooz.com/files/89999854217.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/9809142400.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/96948941295.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/34857197542.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1417103d---pulasa.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_off0000b2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 15812 bytes
SHA-256: 3426dd576187769441342551884deeaa85b29877b3010fde45cfc496c4bf4be5
font_02_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10668 bytes
SHA-256: 9a1e3bdf03237082f66ba9fd1bc3fa4577a9648e5a3eb62426b6c6107b6bbf81

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