Malicious PDF — malware analysis report

Static analysis result for SHA-256 671366f7d0a7fed8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 19:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8b2396ba184eb8379bb5014eef99523 SHA-1: cf20bdc6c10a7df56e1c1d7a3b38055894ef2568 SHA-256: 671366f7d0a7fed8b70c67864a36102936b0db72166b6c4fce78118820490fc2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm, with a high ML score and ClamAV detection confirming maliciousness. The primary function appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=phantom+iptv+apk+2021 PDF link annotation
    • http://oresteruggiero.com/userfiles/files/rimovokigifeju.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e557a2cabd---61974945581.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/zanovep.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fuvefutakir.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/89767952413.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/8410163111.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/bumejiwudixamexageleri.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tidaz.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/3004717650.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/pamemefaxisolidijoneguwij.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219443534886.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/14609877181.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sq26fkvedq1v63548baaf7g960/28786501403.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/53980034191.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sideriras.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/27064497900.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b119e58d40---tuxanimukexigarapapi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/44085041539.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/punojubuvukukolufiwid.pdfIn PDF document text
    • https://jagominum.com/contents/files/losuvujigijezekezo.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/25881957566.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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 10524 bytes
SHA-256: 5ffe20d5e90deb24dd750a6696320637bb5d1232e2fd83ecb33beb1723df50e6
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 17496 bytes
SHA-256: f1cdf098f617625a369bb1eaa30c8890a4c881e0edcf7434f289234437d34df6