Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d25aa4642c6d2d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-02 13:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e98a59d8d9eeffdc353c07f371384d9e SHA-1: 9935882b9637d405f0d8f37861db17cbd7ff75e6 SHA-256: b7d25aa4642c6d2d5e19fa6e23fb491c71bb4f1793adda44b4d0000e21f3ff49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/3d31269340ba379bb1b582139fab762f/72558365044.pdf In PDF document text
    • http://notarbrazda.cz/userfiles/file/jegixigalesesumij.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104beae79a38---dipofexifaguxapega.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/58560025723.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/54671032419.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/sifesumifodane.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/mopef.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/fopokojasizibofinezawor.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7b8a94f---66316559535.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/97258599582.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zekizuvedapo.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/kurazurodaforikojizowoto.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/sujusijekesozajuwi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8b615a2d7---58293493295.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/68137166784.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4daa88c8---zaduwox.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/keripisirepajapinuwu.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/libujidelafuxukaresutaloj.pdfIn PDF document text
    • http://geose.ru/userfiles/file/55629731254.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/lejobino.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/46201190605.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3975a627d---rumafolid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=granuldisk+service+manualPDF 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_off0000b2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B8 14552 bytes
SHA-256: a88b7c141938b1369722f751ad00beeb7018ce66c32b026ab2111121f66112a9
font_01_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 10612 bytes
SHA-256: 13aaada41819369305bc26fc632ac1823ea8709addf56026e0f03295f289bc58
font_02_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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