Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0761c43f9e3f0b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 01:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddb9704890c5315d9b8626dd83e20288 SHA-1: c98f1e90b682b78e6742b8e0160489213686f5ad SHA-256: fb0761c43f9e3f0bd22b5c2f1203052b0dc6f79c910df6a6900c31f8169f74dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely lead to further malicious content or phishing attempts, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=mathematics+for+elementary+teachers+activity+manual+answers PDF link annotation
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/09c202f62e67d86a0827dd2f7ea16d65/48429674059.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/sekelesaxifegiropudine.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/43112922122.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/55442369130.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160813f50c6b55---gerabivat.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/zofopugerukub.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/58157134859.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd33d1bf97d---kexafanogenisevagatide.pdfIn PDF document text
    • http://offerparts.com/upload/files/suzudoxikitisunavap.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nubovasufonezisa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0o7e8rl7ifkoi5is71v3p765us/79386143832.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/56556447808.pdfIn PDF document text
    • http://langmypham.com/luutru/files/60852809351.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108041520291665.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba007639d69---37630914116.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607692b2a400f---71230695649.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/xajobuguwaruvozuwaliri.pdfIn PDF document text
    • https://castel.ro/userfiles/file/83791059744.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/u6597q834kbnvj094ah9ct3915/vililonejemazelabupodatul.pdfIn PDF document text
    • https://dineflon.com//files/xumoxesetirevakela.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/wirenegejemeronewavexe.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/65108917094.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4d4454381---budiwevakulijidivuv.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c57edc1030a072ee545c82707f042f1/21751278924.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_off0000bc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 10960 bytes
SHA-256: 4bd4388f644e141ea9cfcb146bc8dce1a77c594c01c655431282f48b0a50e89c
font_02_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 16792 bytes
SHA-256: ee6d4c39b32d5839cc4e12cd687e3dd83cf9e2e0f84352946fadd44f96c6df55

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