Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74f3c93e5450141…

MALICIOUS

PDF

95.2 KB Created: 2021-09-04 20:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 555b1d6d5f6aaa34c402dfab5152cb1e SHA-1: cc273a7bb16fe191fe607a1bd8c47ad5d13504ec SHA-256: e74f3c93e54501416cef6d1ba977744dc68b6c72fe44730883797debd52cd1fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0umg4au0bcu3cpgdp5tg79ccea/68419252725.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a575908487f---mafasagirazewukerari.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608112b788184---25670514935.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/89809221341.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kd0rt7eh69ea3q6t8hq9u35rl3/13235590527.pdfIn PDF document text
    • https://magerp.org/upload/files/38932268459.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/57486989630.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/49008599456.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b2b0d76ec---79072386196.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/42293947096.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/gawugagosefenagipima.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702535a149---36417351107.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ghco73i9h1ga7a4e43bgsp6567/xemeninotumilezojunewu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/56954421003.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ca511a298ac44de2e35e00c3961d5444/97961203203.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/2d5792a9143d3b1ddfa3f9f0c346b792/90081820162.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/44990681620.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/89abcbb23835a920f1fd8bb420de79a9/16155073668.pdfIn PDF document text
    • http://ipceurope.com/assets/file/93161442999.pdfIn PDF document text
    • https://asiajitu.com/contents//files/96210621259.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/66378686859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=partituras+cristianas+f%C3%A1ciles+gratis+pdfPDF 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_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 21420 bytes
SHA-256: f5fdce58c2c4edfe003ba448aa9db3bd06c9f12bce6c939a1fb23c389e620650
font_02_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 10956 bytes
SHA-256: 36bd6ec55f9e9ebd3db1bbc10671f76f11abe93600a615949776fb38649a6a09

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