Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bf3ba70b7fa572…

MALICIOUS

PDF

94.6 KB Created: 2021-09-17 08:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f8a3aaed549401dfbf3461754d0d2b3 SHA-1: e27967b8e792c3a758708e766ba381f95f9f736f SHA-256: 17bf3ba70b7fa572ec795e867f720c369f4f1f49aab8b80e5910be0620034ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs are likely used to host further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4e7c76f3---82272696749.pdf In PDF document text
    • https://malinaionescu.ro/userfiles/file/20067658058.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/34868648543.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/66787791276.pdfIn PDF document text
    • https://phunhai.net/upload/files/76665421081.pdfIn PDF document text
    • https://csn-alliance.com/data/files/57577345423.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/4429513476.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/6234289777.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614169ada6039---78767846955.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/48562407307.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/87723798779.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/13647142782.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/62kkm64vv0mvn467t3a3l86ko5/gofodezo.pdfIn PDF document text
    • http://geotersrl.it/file/nasonazuxeridepotumi.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/sirodugi.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/953711388.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/33694949097.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210907042728.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c5793992---siwul.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed360e0886---vabonuvonu.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/91367502547.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f7109c3b---kazidudaxaxaliju.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/90698758913.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/30040972390.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/178488437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=easy+star+all+starsPDF 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_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 19268 bytes
SHA-256: 668052936f5179400cd383c7c68c22fd324f85a40a50ea0c1ceeaa211e05edd5
font_01_sfnt_off00013f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15747 9748 bytes
SHA-256: 2827cd6cb74e5b152cb947c31ca2469681183f2543c873bc4ead6e71703009f9

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