Malicious PDF — malware analysis report

Static analysis result for SHA-256 84104a0a42226a07…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 10:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e83544d4da0686cf15f7d450b7120760 SHA-1: f3a2ad864000b48c739526ba9bd6278d276a76dc SHA-256: 84104a0a42226a07d865ae9a3c88ae8defc7f0b81c2148ad8116e51befef0779
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious content. The presence of these links aligns with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cbestdesign.com/ckfinder/images_store/files/42859642537.pdf In PDF document text
    • http://df-2.de/images/daten/file/69596271853.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f21cd6a47b176bf85e5f49adf421642d/jegojosab.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/tojemukituxowef.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fade152ba---20724197944.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/30389322107.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a938d44b82ab70344938f77bd0702787/vamit.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a2021c660ac48f11b8402576ded86cf5/60725364089.pdfIn PDF document text
    • http://planetamama.ru/files/file/wixekebapewuxaxetikukuga.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/89215192472.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/kojuk.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ks7v36d2etjcl30f5rk4t0l4m/poteped.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609df54ca3804---janura.pdfIn PDF document text
    • http://www.toptehnik.si/images/bobopam.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/sumipelajevivexim.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/83074499859.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c8ea7415---8987908156.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c973469d0de---suliwo.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/80795121029.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bomumupolijajoxiv.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094643fa4a2c---16073548207.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607939056de9e---84785195345.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/76774219351.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c284494412b---kijenezigeluzefofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+hitcher+filmPDF 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_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 17788 bytes
SHA-256: c0a7cbb0cfe97f4c2c985bc840e8e748a6ea3385872aa8366d3f3aac840dfe1b
font_01_sfnt_off000136b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 10012 bytes
SHA-256: 3834d6d94f917e2319dd128afeacbedf277b035a0f82e5197e0ff9833ea36e22
font_02_sfnt_off00014cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1