Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e18bf2388acfec…

MALICIOUS

PDF

88.4 KB Created: 2021-07-15 12:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f91966265cae41c72cdab469350e4626 SHA-1: 1005059e6cdf6c53dbf0021621368ad518d00b60 SHA-256: 48e18bf2388acfece0b17fbbe4ccdb4c67279653316e1c6cc5fcf3d8e469ac5b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics suggest it is likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/56onk6uhkllduljs26a93t7pnd/59332394688.pdf In PDF document text
    • http://enjoy.sk/editor_uploads/system/files/pejugodetoluduxesin.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160782e03ca715---zekanev.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/43210583155.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb610da27c5---59723310479.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1f0750c81---sejasupuz.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/30125945238.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ffa8ebf89---99981236805.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6b11e879---32449256125.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/35369ec573796b7d9ee1686d0d262795/37823618771.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1ef813803e7ccdd0d5ee1aba52c34460/tukevagobelazemoj.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b281efa9b---jodazu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8c4a13e0e2---98165360045.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/89956599565.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/tarerogutogumuzimiv.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4otdpn9vhlooidsqdkr9q8k1oa/52374396007.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/abe42c0f698f930333f4be66ec3af511/62068593190.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/fb6d9e0855992b44c1ac9e5156ac2a0c/6574862803.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/wisamorolodatixewiseze.pdfIn PDF document text
    • https://agatanorek.com/files/file/42470553538.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/jatufi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b6049a8d391---zebudovatasokejab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=havoc+brothers+tamil+album+songs+download+masstamilanPDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 18192 bytes
SHA-256: 5c5906e9d87a85923c7a10d58ef962bf837f75ff0f7fb6c19ae0d321605acfa4
font_03_sfnt_off000139dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 11200 bytes
SHA-256: 1206bb9c4f354be143293f84c3bc34621e067d7f72fab658a4cf98dc78ea1c26

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