Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cbf214962de864…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 19:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e08f69c228efef46082b81de41782e25 SHA-1: 6b4a8998d45d68eafbb67cc615539f794967108f SHA-256: 05cbf214962de864b1bf56f2b423e04924deaba76f3dbefd62d8915fa3b71ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trieurodata.ro/images/file/84449489954.pdf In PDF document text
    • http://claudiamelchior.it/images/file/limazawenudumuginibotamuv.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gobujivizigewos.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613488af8c138---nineburimisesixajolo.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xaveverixidigojimofiroru.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/74853227885.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/13420230375.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/97443732502.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/sogoxuxometagitogodo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/tojisojukuxedebolu.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/26893824676.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/01ae64919997b63423ef6c58dea54169/93053648390.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b3518c18---40952456751.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/35571138964.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/94437947761.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jodagovumevitog.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/nenubeguveniz.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/nedefodaxuwesolokidi.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/85972372327.pdfIn PDF document text
    • http://e-sheremet.com/img/fezebunedojepunejew.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/56095397578.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/76251842136.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/98301384772.pdfIn PDF document text
    • http://didopack.com/files/83416819921.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/48445494019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=longtv+dns+changerPDF 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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10532 bytes
SHA-256: 7c8c034672431086ba24546f32bb900b77c237806110c262b0a1b0c9284fbd2a
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 21276 bytes
SHA-256: f875461647555f91bc9a99e2e168712a62e4a15dbbefc6c79610dd8877488b42
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1