Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7227f89b91ceb67…

MALICIOUS

PDF

81.6 KB Created: 2021-05-02 03:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e6f09bf0e8e2aea231c1af5d6e486317 SHA-1: 865c21aa5f6182f883ec970d8cd143c749dd0e8c SHA-256: b7227f89b91ceb67ef44fced9066ae04bb9143c96f69acc5c57ee24883abe8c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF structure and embedded URLs suggest an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7us5qv8e4orbvntvbg8973mb8m/xerelabepevumukog.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nbjp8jg26udl7tbf8u48rqftl2/67304925574.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9fa826e05108549d5c38e95de74de9ab/63806519386.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/465969e28ab72052c435447624ad99d1/zisidovorenuzuv.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160870e50431c1---91741573622.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pokesidibamadida.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28a954a1---14684309985.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9154efa8---fupovoxikupiguted.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0392be44654d36a0333b85559eb7e8a8/94702688584.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0177398f9b9d168f8af2e02740de179c/59804583704.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/26ft9trv69108g2n273mtrlthj/49143648435.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1eoak53peqis0rjkkqss3jarr3/97175407496.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/olvhpob88a0ih5vrh9k4f6o7e5/90459092861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=junit+surefire+report+htmlPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000112c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112C4 16444 bytes
SHA-256: 4e9cb8c99b86462f02c5511d7aab4d8c24399916f0f7e3b3b99356702f9680c3
font_00_sfnt_off0000ca95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA95 5108 bytes
SHA-256: 1f1a5fa67d4fa37a123cf131cedaf845450890df9eb937822aef02221d1be70e
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 4804 bytes
SHA-256: dbc1703b1563804787bc7ba8a4a278e1d4774afa0edf9448d081059a79b5b69a
font_02_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 11236 bytes
SHA-256: 37f035e65dc7b0f776c3113ca4a9dc0b71e2e5a87e05bd4e141f69c6a991663b
font_04_sfnt_off0001291d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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