Malicious PDF — malware analysis report

Static analysis result for SHA-256 12994e1e4dcb35c5…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 14:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aeb5eda7daf7986f0e9c60ad5446425c SHA-1: 34a16f22d62afcd696d51e0ac10ae63e97319679 SHA-256: 12994e1e4dcb35c50469ddccb2c19229fbb22ad4e9b8c0a545a8b8371d2a4fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO poisoning to lure victims. The embedded URLs likely lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=ncert+science+book+pdf+download+class+9 PDF link annotation
    • http://axiomestates.com/userfiles/file/33391285213.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/31154df5f194f4d38a8694ac190577f2/4158274284.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/6119508766.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fotapudimidiw.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf44141d5e7---60394378626.pdfIn PDF document text
    • http://tcihk.com/userfiles/sodinulowifoxijilatebevoz.pdfIn PDF document text
    • http://altinay-law.com/images/file/malal.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4t9srch729u5sejfcgc9n8l5vb/waforinokogexajureguwudif.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2fa9a4de086c35089491b8e16584b7f4/62781154663.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5222112fb9d4e8c1dde9f5b3d85c1443/11128981503.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/tibewunerirasaxuturodupu.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/69487650866.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c906d3ba---jugubiravilokopozu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b348e73b9d---sejalusilonumegikaguw.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/gomovufopikivigovaber.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/ninumugotaxukexasex.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210619070354_2sl1d3.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/83872035339.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/seligeruveboluto.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/10809804197.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/nitunaga.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/dbrkg30aopbj7l9lgu2lvp37f0/48778702539.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/verigasufugin.pdfIn PDF document text
    • http://wdnederland.nl/file/majafe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160878597753b8---rewowumunedofusipasiper.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/43331086211.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_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 11076 bytes
SHA-256: 24cd554b49778809f4b8fbccb0c2661982623e85696c8b62448225dc3d90cf86
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 20224 bytes
SHA-256: c53b74155d25305e12c39a5d9cfa9959ca8223afc8e6446021a8e9d277bef5a1

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