Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb21e8543f0fbfc…

MALICIOUS

PDF

91.3 KB Created: 2021-08-19 11:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 5cb37e739137dc0bcd297d25b7d28ff4 SHA-1: f80445955826ee37e1556b9d47cc0992ba955332 SHA-256: 6bb21e8543f0fbfcf4085d21176e3fa3e5213eed6779e7658a0cefe8447b3668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://kondicionery-lubertsy.ru/upload_picture/file/79434343427.pdf In PDF document text
    • http://renovator.cz/files/file/balofugabekoliged.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/110636477.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5c302b335cc10305410c6852200d1921/jolatonaxufazunaniju.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/durawifevuj.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fonalixifudokevumelux.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/21775338721.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/86802172961.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e21546c53---40383832657.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a994b084848---41025020988.pdfIn PDF document text
    • http://araonline.hu/uploads/file/29010020911.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dafb4745---48628245372.pdfIn PDF document text
    • http://cutskytools.com/d/files/50847840693.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0aeeb08db---3776051017.pdfIn PDF document text
    • https://rosycaffe.com/file/tabaluxa.pdfIn PDF document text
    • http://gekon.net/userfiles/file/95455276921.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/943ec255f352a14de576598f29c71e6a/96961039410.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/medaluratuxaxalam.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/30328950216.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/xewovujezafo.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/sanugasej.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/48570714863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ejercicios+de+pronombres+personales+4+primaria+para+imprimirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 16180 bytes
SHA-256: 5fe250aed078d0ee0c8a6eeae28bcf3660a94536c0a26c91209d7ae7f0165d2f
font_01_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 18876 bytes
SHA-256: 16e85e40c288424cb9c5dbbb7acc904603bcf43edfc001295b4a05e160c16ae2
font_03_sfnt_off000142a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 10908 bytes
SHA-256: c9dce24d95c915b2ea5004e2bf3d28417217cbfe477dd7abdab02f828148ce4c

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