Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a7c49ce2a809ee…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 05:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05d20bf6f206c291782c08b8d5164de3 SHA-1: 441139387d6b2b62ce39805ed1045679e4baea1d SHA-256: e5a7c49ce2a809eed919ab7fa2bab7c6666bfb13cb70fbc34f9703fcd5c01d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is a PDF containing a link farm that points to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are typical of malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://ajivikafinance.com/userfiles/file/62672038029.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9vgt8dvmgbnua0bql9nt9u246u/96381889064.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd3585367---voborusulipupedigozokoso.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/4673111606.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/37923703217.pdfIn PDF document text
    • http://hainfelderteich.at/18938737005.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120411fcf68a---zimavoja.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/34584713048.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/78906134779.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/julejotazumibizabakazumok.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160709475a3c68---54786572406.pdfIn PDF document text
    • https://serka.com/serka/upload/files/91621694828.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202181543202477.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/78308802969.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/rililanifimig.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/tefefisusodupudenabamepal.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f8b95554d63cb1e48828720c52972c7/69581835983.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b4d381e893119976ffe1df27776278bd/wozumodowujena.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/53499112508.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/303b7c7056899b874cef862a83b54d36/49009797332.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffcc7913cef---91246532321.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5ff35a73---remudip.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/xexafedadimizipezawukevo.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210619193014_85jl07.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/iieq8fhiu9787vo6inhrrh0ol7/51776633516.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/65349173477.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/a3btprurfoll80fmmp3c7basq5/96347293631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=is+running+2+miles+a+day+goodPDF 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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 10776 bytes
SHA-256: 270707095b19666f0c9ec4b64383d1a3c01878af33ac3665f94e6b176cfcd377
font_02_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 17628 bytes
SHA-256: 86639141415d9ea6faba37083c9c93340ab149c9fa8a72aa0117418b6d72e792