Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3aa408d1de8b1c3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 20:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cce2852699008c730752267f0b07983b SHA-1: c74753cb36fc973290dc947676893ed9aa14d64e SHA-256: b3aa408d1de8b1c3c903879e79575595c43b92559b1f4cfa0141b0dac1360c17
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The document's structure and embedded URLs suggest it is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=rhythm+of+life+satb+pdf PDF link annotation
    • http://cabinet-blin.fr/ressource/site-image/files/46687995822.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/63815579587.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0916db0082cd9646301f3eac793e5ef/4954293826.pdfIn PDF document text
    • https://bem-sa.com/img/file/84288942905.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/70903732090.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ca64b54661a---rotok.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/nomitewaf.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687d7e34ba---81285191244.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/sijenavukizanoje.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210718/0213287156.pdfIn PDF document text
    • http://infosierra.es/images/editor/74779847531.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2446d4562306ba03b83139f08672d55/20712410557.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/97125342269.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/temujuxapunor.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/29281b102bf133c1d729889efb1587b8/vivoguxiwodizuwatas.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e62a0303---vemajobuxirabugegox.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608569dbd5bcc---67768290801.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3ebe5ba6d75e7af2f79853deb48b8028/93992159205.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210727222654.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fe5f515ff5decff9be342a53eedc5d38/7148889824.pdfIn PDF document text
    • http://chinalabware.es/d/files/59560927726.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10856 bytes
SHA-256: 513a373fe130cc39e6325e025e8d812d84f7242d384b6d4970e44887b8d20ce9
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18492 bytes
SHA-256: 2142f3e63af7014908fca1b1e83f139247c0627c1291edd173f1468a0665f57c
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1