Malicious PDF — malware analysis report

Static analysis result for SHA-256 a913b89556d5cd11…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 20:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b79283520190b653111a8a9aee553e99 SHA-1: a7cfb59e71748173d4c0ec3d94d2cfb216530411 SHA-256: a913b89556d5cd11808b12e7a53b11ab6f75cc80282294f2351dfc5c7cabd6e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and link farm indicate it's designed to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=iso+14644+5+cleanroom+operations+pdf
    • https://hirurgija.me//files/dulalageziravu.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2382244dfc---sozemet.pdf
    • https://werbemittelag.chupload/file/puwaxoweseje.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609154be69d6f---rexevunofitakem.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6b0e8dd37---74931760396.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8d2a5c2fddbb565ebdace73d8510a79e/78315137231.pdf
    • http://unseretochter.com/images/file/xabuzunorijo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a46abe7cc---17584740038.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719a503b272---pasudolusosirixozipemuto.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abca1dd1cfd---31457779541.pdf
    • http://scvumaichiramen.com/uploads/files/telezotedejunoza.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4070f54d3e6de42b7791f6143ea5726f/wigatekizuvofupevuvoleve.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aaa1bf194804d894dd8a94b3b2df2808/28281536244.pdf
    • http://mywymc.com/userfiles/file/11102244555.pdf
    • http://naturalmis.com/userfiles/file/vuxib.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac47b6985a---61399975903.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f954903b4---zuwolunuzalo.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/94d1a60201b514e38e2d44c9cfe47196/39945453995.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b2f73866---33187703658.pdf
    • http://broadgatecapital.com/userfiles/file/tepabarevubex.pdf
    • http://the-bom.kr/upfile/files/wezenofasij.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3409cb8ea1---dugezuwutinawemubadawuzu.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e3a93e32---38225393952.pdf
    • https://purefeeling8.com/data/file/senukoximesojexup.pdf
    • http://ziconiavip.com/uploadfck/file/manopemelikunerozetenova.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f204.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16792 bytes
font_01_sfnt_off00010a1b.bin
393d97858b38ad4b96f2397f3c05d45bf68d260f80c7ca01d46017b5b5222dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 11164 bytes
font_02_sfnt_off0001244d.bin
cdd6255d2cda685918d24861cb8d263b1a793a258209bb8be2e461b79fb975f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 16404 bytes

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