Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d5d3c6be9a7fd1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-03 11:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cda6e36661c153b634968647d8113b77 SHA-1: 986610844145839d583d0d52d2934f3d03ff4d36 SHA-256: 12d5d3c6be9a7fd1d1e19b92504f58b4b1d4f8814f14314a526c76324a768e56
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=meditation+for+dummies+pdf PDF link annotation
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf130cde67---24926029075.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/dizipogatexi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ddd5e1ecc63dfa6f460f0b92a2299547/39396100626.pdfIn PDF document text
    • https://redac.ch/upload/wenajanozarupe.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/popudij.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/23694616458.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/dcfc152a31e6f42011193abce2dfda85/66397212215.pdfIn PDF document text
    • http://geotersrl.it/file/botijizopegekamux.pdfIn PDF document text
    • http://freeski.hu/freeski/file/kodiximovonukupuwuwis.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36450e3be---54319280683.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ru8smvmqh6q499dtdqbp8sfep8/xagowalinoliseji.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/xofexes.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/mamukepixaxo.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/28326830605.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/mikupiratotu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/suzasagegenipunun.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/57886403084.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/baxenefes.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wukeziwelekex.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/lanadafimogiletewagijijeg.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/45946564923.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_off0000b141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 10708 bytes
SHA-256: 54c1aad543cabf30144ee4caa4182c2bd60dc3fa2af218f3a430b1ee0e4f354c
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 14756 bytes
SHA-256: 49eba4e4b7aa40ff4a8792f23dc3b452a632ce1a94573f67d45a0a1cf7718ea0
font_02_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1