Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a4c05fdcbe884b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 04:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee0325dfaca16926e344096193af00e4 SHA-1: 59b6d2c0fbfcd1f6eea524e008ff5b61efae9515 SHA-256: 05a4c05fdcbe884b4c2a0376d7de4eb394d31beacd9611e61f65e7ea9a3f9912
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of external URIs and link farms points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 http://www.hausbaumesse.at/ckfinder/userfiles/files/23606238066.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083c37916750---wejafigusazakiguwi.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/pobuxivurupunemodo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/031f353d434674903d8ad55747d00e8c/resikepifowinukotibugi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/72545637812.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/lejewexatemafopubifibo.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706a04c8a33---movepoduwupud.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/31635278503.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/98512945444.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/falikebixozijepibegekamo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ab8a8a8c6755cdc8eb6b7b0f5fd5c1c/77899384044.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/10443872988.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/55498252567.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/niligejirasufin.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/xilewatowutevozizi.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/waxibuvafezatamozujuverij.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42aa982a03---9932884062.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3ac49acedde5926a80efa3f3b4dbd763/fasoxilaxapurog.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/tobalasupurubolunetiwo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/cpt9s9fqka2phtstrqkvde6tm5/xefujadobiwupuvidemefeb.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cu88jr2vkfk121vdm5rfs5jap8/94982274781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=naim+superuniti+manualPDF 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_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 10372 bytes
SHA-256: bf50ad92b7231eaf291679c74b83be8f169e35d3e5ab2d55bf1b78a4fb0aa8b3
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 19448 bytes
SHA-256: d76b536604ed39e6790d5cc90ff187027dd1027ae7aac06ab68f8f8d2a0adc92
font_02_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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