Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddba8ec2e898b09…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 20:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 713b46393da4e275c83a562baef333ea SHA-1: c8ed6e55f8ab1a2f87b906cfab3aaa21d7dcab8e SHA-256: 7ddba8ec2e898b099bea019a67c671a970c597b7f94d966ca1a4f48a124dc2d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 compromised WordPress upload sites and disposable hosting domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially malicious content strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610474eb04428---pajol.pdf In PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/18292892890.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/sakidanezisavevidonu.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/68414218801.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f878d891f---77406430125.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ecdfb6d0e---29441110416.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/domeluza.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/wowugoberezovalag.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/89937192511.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/49059659808.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/baxufaluzasixofalomisij.pdfIn PDF document text
    • http://furniture83.com/upload/files/26337515303.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/38724613810.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5ac50db9b65ccf84a2577259992d6c1d/dadebewomileguwuvovuxa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b000bb32aa---pidozelugamipujupeganirel.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/tupazojefo.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/63486333193.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2af48f2b056f03784f3dbe19e8048a75/26127015440.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/jeboxiwixufozeja.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125c5464009a---nulawodefelupeti.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d5cb026c8d5a5fdef4e5ca933795d9bc/xeputuwuzasorodem.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bf38c17d---fexigeroliwiwusugima.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/36318855511.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/nowofoteboturo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=develop+self+confidence+improve+public+speaking+by+dale+carnegiePDF 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_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 11380 bytes
SHA-256: acb0648f43e1be89f0ffef4aff4c625b1050c5769ce3a1e932d680a0dba3db08
font_02_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 17536 bytes
SHA-256: ae9e709c4c9a17ba83e2c5b9e8587392459d6d8f5cdf459477180cfae4e0dc46

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