Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d8c0b39ceeaa3c…

MALICIOUS

PDF

95.3 KB Created: 2021-07-14 10:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3a993c6d015621f8a41c780b28d8202 SHA-1: 8ca886571c1dd55254d61a9ce1c8d4db206fffda SHA-256: f6d8c0b39ceeaa3c29453410bcf59a05a2534ecdc6bc40a75cdca9f1cf40e1bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download additional payloads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c5a5488c---42533986657.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/juxofosege.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/tavimamesuwavasofamazokuw.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d47cd461---jolujowuzufotoduzetiluv.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd89884626b---10392602827.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210604_13280EC702BBD592.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210627230511361544n0xsx2.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/6a9sfdrtnq1earf91r6fecokcp/pozigifepenas.pdfIn PDF document text
    • https://datajournonepal.org/files/givalum.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2674900a---39100532433.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/falizaposoluxofipazebidis.pdfIn PDF document text
    • http://texmet.pl/userimages/file/2370547570.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/pqlfpnfrlan7usk4fsll25ed2c/wonibiverilatubi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c6bc4a6627f679eb8fe88e535758a43e/zafinuvesapekite.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/40813579953.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/43552426260.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/gozezaxosasawasor.pdfIn PDF document text
    • http://muszempilla.com/files/file/lomufiximad.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/23515110614.pdfIn PDF document text
    • http://yuha.be/_files/file/xinakagen.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48140344916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+professions+for+priest+wow+classicPDF link annotation
    • 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_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 16776 bytes
SHA-256: 8aa1e32707c9717ed3b3ca3f12890f1e688aefe099d61581e34f8382fa2cf895
font_01_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E9 10612 bytes
SHA-256: 9c6e78cf4798aea9d4dba19c0f00fb3180e40f001df542b4746b0687e03ea5da

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