Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b744bec69d9043…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 11:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04f2e1fff202cc1b8d80d88cf8f48190 SHA-1: bf00ab9e36d224c20438ff9ced90765f3df72cd9 SHA-256: 11b744bec69d90431d1a7c71a86feb6c3e2e335d25afcdae2671dd825fd87957
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to a compromised WordPress upload directory, identified by heuristics as a potential lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the presence of numerous links to potentially compromised sites suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132058a6e84d---sosutozozolujokefafovosoj.pdf In PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/fixupo.pdfIn PDF document text
    • http://klinok-saintp.ru/files/59143496292.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/68930740763.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/25250506129.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/58227853804.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/8829016446.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/2454803315.pdfIn PDF document text
    • http://jljemc.com/upload/files/9009620292.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/32803065477.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e652524f9f---70192575277.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/82261584464.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/69755185123.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/t6ubotto25n17omn2c9u4dvav3/95257544464.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d8e892cc696c794ca7ad720718c05f1/87692869860.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/piwifu.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/83363153028.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/54199355344.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/11755620192.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307f0f105e3---damobileba.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/47852093870.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d159e3105740489fcc952c26659a8563/kotulewojaweper.pdfIn PDF document text
    • http://telecycling.org/files/file/73735903782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cleo+gta+5PDF 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_off0000c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 17628 bytes
SHA-256: a00c696206aa87cde32869e1dd9dc8e09af344415a107d1f96c5f91f6aff0972
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 9984 bytes
SHA-256: fbb5b3c753a1730b231d5a349be21c146df3ace1dfac9ccb7ea6d6d081f17ab2