Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6414b569bf71c4b…

MALICIOUS

PDF

128.2 KB Created: 2021-06-25 16:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 28da2433cf33f8626feefdda5964fd9d SHA-1: 62a8feb6ef1da0f4a25c5625c91c8e52d9adad39 SHA-256: e6414b569bf71c4b9951e859efa44684cd787fa614737536c3afbe1f8b4335c1
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. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs are likely used to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=corporate+level+strategy+ppt PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1a5c3a5f2f3fb80ecdef5aaa3d2cb5a5/xezarunejegupupasirin.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/72302394358.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/roxuga.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/p48gii21fqgsvbrg404f2uo0o9/medulerazalixafikunifeje.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/muvamopijafatugupuveru.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0esarp43fhld7j353j1dsvo4e6/98342381731.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/he8fc4ft5r2kpdicp5p6tq1co4/94945104446.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e5a6d67909936d70276a58e9fab4de86/pesineramimoneku.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2213cc3e---3820454597.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mikesulideledan.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609441ce46697---59093909827.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0deb8564---roxuluzif.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5p6b338idb8mdl6d4c8pijjm85/tukit.pdfIn PDF document text
    • https://ms01bet.net/contents//files/20412955405.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hq110ikv030tbmuvajfoqmn6vd/limituv.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c3b9258f---mujezigataxijizuwokupefo.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_off0001935a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1935A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ab6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB6C 18320 bytes
SHA-256: ef9ed4299468cd65ed470109f49d81b2142fb7dbaf957e18738883c77bd82021
font_02_sfnt_off0001dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBD4 10444 bytes
SHA-256: 9358e2531233e2a5ca4a6efedf545cfc06946452f7d167762a5d5769d278f9ff