Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce38dd9256a9d8e…

MALICIOUS

PDF

79.2 KB Created: 2021-08-08 23:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c869f793d038c094f354254901c2108c SHA-1: def7a9ea00c737a361d7e2afbd17a0a34a86f543 SHA-256: 8ce38dd9256a9d8e43d11dbd6b21ffa44f56a3078c493d6a506741fd7eb45bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as https://irlanc.ru/uplcv?utm_term=general+aviation+aircraft+design+snorri+gudmundsson+pdf, are likely used to redirect users to phishing or malware distribution sites. The PDF structure and numerous external links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irlanc.ru/uplcv?utm_term=general+aviation+aircraft+design+snorri+gudmundsson+pdf PDF link annotation
    • http://jnnycc.org/userfiles/file/laberonadutedula.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/80bb8ea23e77282fdd8242d53eb9752a/vesowavepi.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/rupod.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/xabodototukefisozamefe.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e7e503c7---gofinuvobirajibowip.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a088eb74805---71536964632.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/vafevaxuxefupugowadogez.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092f994a4d37---81213647908.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742afe4f205---11675553550.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373444b2c8---605697957.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aephddc20ea0hs3fbf36okl6g2/xabuni.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/92103634711.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ol6bpl0r5mn4vs7s0g2sa1si2f/83056824142.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/cb73h04b4tv1vg27ncbsuo8v6v/11171358186.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/34352f9b20859e1a0651e8bae1a38b1e/gumirifosaxiku.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998101de5fa---71319468206.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/91f153d44f95b5235bab1e3a0500541b/tidurezuvasofiragif.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/14458055328.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/60379803033.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4de6748fe---49310224892.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/aa599a2c7b7a08269b38cadc56d743a3/15586431281.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_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 16496 bytes
SHA-256: 3078f66030a4fb6151389616a6494c7eca1c8ec19e0904a203f4d84dc573c8be
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 11168 bytes
SHA-256: 20740911bde77bd37871d6bab07d69373c11729a9a5b86ed2bd335202068b532

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