Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e5d3173af07bde…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 16:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 198524dbc895be2cc6d11f5e477e324b SHA-1: 13823164640204b93a146d7235425b682cc62858 SHA-256: 27e5d3173af07bde50e3f739a952f6fc2451aedb8bc161585503df9d85f914fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 various domains, including compromised WordPress sites. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=new+best+friend+2002+full+movie+online+free PDF link annotation
    • https://vinacomvietnam.vn/uploads/news_file/riduwi.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/mawubelekot.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/fovejamekemoxizakujorojo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/27042355384.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/rapedakov.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/60588477656.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/61611688347.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tesesekuneziwumuravobop.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/40750980129.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210904221115_lsc5gs.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/29969962037.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xudavafajelesom.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/21408288731.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a32bdbc5b---judalozoloxes.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/bunuwimatileli.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/78517048373.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210912084945125.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f945d42cab---talab.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nidetozoposiv.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebde72eed---gufupajudanizakaxo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q456g3crcrmpt8t14nd3o9q5g7/vifeletekef.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/22716446662.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/55929363634.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gexojiwukepefexew.pdfIn PDF document text
    • 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_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 17668 bytes
SHA-256: d71f055a9fae0a494f63afeded8f10e346feb739e4c2c68d1b7e7355aba2c179
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10964 bytes
SHA-256: c6718aea920f8c8d92d6628edf519878531b64533be82361bf8a189e8ea1761a
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1