Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb0d8bac5c483cc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 15:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ab6c7cde20831b873dfd2d213012e9e SHA-1: c2e290c80a055c3eecfebba6d923fbeceefd44e4 SHA-256: edb0d8bac5c483cc6711ceeba71c46d79f8345d33e23fce3177b1a40aecf87d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other domains. The embedded URLs are likely intended to lead victims to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0de80588---43127599632.pdf In PDF document text
    • http://tdsns.ru/userfiles/file/64966049320.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161479e93f389b---9633999959.pdfIn PDF document text
    • https://ratosatu.com/contents/files/14907844391.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12593746358.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/58200857742.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/332d75c4d59094f475a8b04ab760b2f0/8666222601.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/39743064402.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ece7e4d5---91419756721.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/89869296471.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/1870186481.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/395033374.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/juxirabatatuwuvakezu.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/94854316869.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/ziravivusigovemeb.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/masoje.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/bapagisas.pdfIn PDF document text
    • http://dwitunggaljaya.com/sitefiles/file/64136931560.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c6030d5a006863ca346d36459d0acfd2/xajisubofixufemabe.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/xatedolinixitefukovumunul.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/jerunonamuzozapemirurute.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/ralonek.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/11580647777.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/monezurinot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+network+monitoring+tools+raspberry+piPDF 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_off0000af80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF80 11080 bytes
SHA-256: f5cfb627e8437092d24b7a0c30a5cd998f4a386edf7e82a4e6147fc5e0b1b3d9
font_01_sfnt_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 15884 bytes
SHA-256: 5520effb4d348febfd4711f02bb6ba7b2c974e7dd5dc82122ca9196c8f360fff
font_02_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1