Malicious PDF — malware analysis report

Static analysis result for SHA-256 b241de6e7904d421…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 21:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba9c236fa1521c5e009e71d7317ac4d6 SHA-1: 655a1cbd6ba17f31775f5c6dd2f527a7fb3f6a50 SHA-256: b241de6e7904d42144edfb03a2cea838e5deca0e24f5a7e6b36f7863bc486f84
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to potentially compromised WordPress upload storage or other disposable hosting sites. The presence of a 'download button' lure suggests an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=over+the+hedge+full+hd+hindi+movie+download PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4992f2ad---jotoget.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/zowazevimemilunaro.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3f10cc49---46626811365.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d338141e3---lurix.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b3b65688eac253d656af33e65b8155a3/27935613689.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/degivusevujosisode.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/ritemowegiposuzeli.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/68f34dda75a361988787f1842e84dd80/82796262576.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfce8c255a---tiwat.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/5941585149.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/wasinifafajavuzo.pdfIn PDF document text
    • http://technocom.pl/editor/file/42726894141.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/6897211334.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/wisodevuwukufafuzoj.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/sidelasekaboxu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/89e687426eb7573c146c16097dcd4864/30020021300.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/dodujafoteroxosito.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/16d13f15b5e1bd4c1c4d6470a63884ca/vedikedi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/14b06731970162b8932afd0c2c87bb14/fovaxikifobiluvuvumowimom.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/wematumiwufuxazawuful.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/1814985749.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b75c243db---lazegabawixat.pdfIn PDF document text
    • 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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 10908 bytes
SHA-256: b3e4362d2e5b3e94a172fe15835127fca6d87826f8ddaffec8ad4f6c90183812
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 16748 bytes
SHA-256: 9a89a6a2beff283d5c53927ef61aaaf796ff4f90d57757e79a2f34599c259e07