Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb85ed2ba859721…

MALICIOUS

PDF

94.6 KB Created: 2021-07-19 12:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54d192ce3213dc5037899d5bd6fb8995 SHA-1: e9d8391b9e438ab8cf80c8df7d210bf7c2a21adb SHA-256: eeb85ed2ba859721ffd40e11b0755b4356244cbc6b3c40cc8ddc4ca422417802
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting and ClamAV detected it as a phishing trojan. Although no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://hotelgiottotorino.com/userfiles/files/78860279414.pdf In PDF document text
    • http://strahovka66.ru/userfiles/file/72317989804.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee7c1679f---gusokav.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8886f3fe4e---polugebesanozekalegotegaw.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/4327747729.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0611ee40---xodivibuxu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62c6e5532f---68795640774.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb131187b1---25512227382.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/resuvumo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r9g05nlj4020qvsp6ftludeip1/49693970154.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/84776665127.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/binagopowude.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/vuruvelixezaxeditodiz.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/nadejuw.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b269d0ca66a---nonokobope.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866f985a7b---sogemumugaxesosiv.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/widorikene.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cf0dad3d217525370380086a295729b7/kiwiwitazesivutijinuromuj.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/38569618651.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/62092391543.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dcaa594474eb4f1540c10474f6fbaac6/takik.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • http://kotolantopeni.cz/file/86297682231.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/95467559962.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/rijusaxopimosafaxubod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=define+polymorphism+in+java+with+examplePDF 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_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 11120 bytes
SHA-256: 1d24a224b74660b5128d9229ea501a0899dfbead066e7af2cd90ed71ecf4629d
font_01_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 17516 bytes
SHA-256: 578b01f42ba29758645a66ce697fcb6583ae61d018d27ac3f1fe5058100c5086
font_02_sfnt_off00015502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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