Malicious PDF — malware analysis report

Static analysis result for SHA-256 f896511161e843c7…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 23:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6f547845e2aa9905039fe7df03f8ce8 SHA-1: 49483d4a3470031e7bbaf16f8a88df0f6dd87a33 SHA-256: f896511161e843c74a61c4893189cd9a1b7ec23a82e77d7cd0c869d9dd3ac704
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to multiple distinct hosts, including one on a compromised WordPress upload directory, indicates an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://otczenacts.com/media/files/91692637404.pdf In PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/72473619981.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/munarasirufimijakupu.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/42338146090.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/xukafot.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/89920681722.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/17366342427.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/mosupesuwakis.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/73582561402.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/11119615575.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/60361492909.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/65560029345.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dv3u2vjqvgfslan0t3fvrhttro/pojagakotof.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/95703968704.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/666844cacabd89b6c9c8e4263b63127d/42696897899.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfaab6251---4577857522.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/77882559384.pdfIn PDF document text
    • http://schubert-hh.de/image/file/wumavadobakip.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/tovelilisobobav.pdfIn PDF document text
    • https://eclearusa.com/images/file/rirukupafogoz.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/zerufuvipewatikufavesusur.pdfIn PDF document text
    • http://ministerium.pt/files/wuvisadodasiminafitogimar.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/begadipigixexov.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141301336b9c---36773014950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=samsung+galaxy+grand+prime+plus+firmware+downloadPDF 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_off0000b555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 17540 bytes
SHA-256: ad8aee80a6f834e5317d098cfd1bfac5a6c30921f98ae7eea096a03dfaf443c0
font_02_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 11220 bytes
SHA-256: 68d1fe6f14d6531ea6afc7d76e2cca673d17820862f555563fa18a021c23698e