Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca82403d59cb050…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 12:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 040ea6a0f4bac350bc8385dd9dc20793 SHA-1: f6c1ffd559ffbb09428fb8e4ee641f08acbf1eaf SHA-256: bca82403d59cb0508d5d2b7d755fcfcf72b6344792bda12d925499c155442410
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS uploads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings suggests an attempt to manipulate search engine results or distribute malicious links. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://europavloeren.nl/siteimages/file/pumomaduvagaj.pdf In PDF document text
    • https://autosaloncenter.com/uploads/files/618868928.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/suxemisofurobisuv.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/57144845971.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b7edc191a8b5f60e9f8f47bfdf072b8f/zugifenuvigifizuvubipig.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vabexaponepan.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb2b8a95b---xarimu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/kusitif.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613325f0c4d3a---30800805997.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6146216f4516e.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/rekutejugojitizuzeva.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/36659504768.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/wenavew.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090800022782.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wazusokolanukomogaperuk.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/70905942264.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914100550.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u6o0orq36l12n7cspbne0ag66c/75533596262.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/60261881277.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/68996738005.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/54031706996.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145aaccb2e8a---98321530904.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/22854407404.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/zejabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+go+to+developer+optionsPDF 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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 17832 bytes
SHA-256: 3dcbb966ee0efe2d42414f9a0d2c4ffe911feecdc16fc5bdc1894789cacf7bb7
font_01_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 10548 bytes
SHA-256: 219a0e39ecce61e4b45df822bcba613d49ec094e8e358b6c1082a994738f2ab5
font_02_sfnt_off00012fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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