Malicious PDF — malware analysis report

Static analysis result for SHA-256 97db1d94f2fb752c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 16:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18d58111259c8b18d708c6082e466625 SHA-1: 5e5bacad0e1f2fd259c2ad80fbcef0d3a4b00d05 SHA-256: 97db1d94f2fb752cf2dba8f050cb1489f6aeed4daa3eac76d0480a67b4c75d34
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://zuche0551.com/upload/file/97344794355.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/90208337598.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/suxopirawudinagojolo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/47817084731.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d4c6dea47---72323230655.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/17217923434.pdfIn PDF document text
    • https://miet.hu/kepek/wizagidegasefogobimudigot.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fetebidikeduripuzunow.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/vuxupura.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/53207001429.pdfIn PDF document text
    • http://getdol.com/page_data/file/pigugipilusabejigijo.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/40860911776.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161443bdab4f84---sukibifopitif.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jamorubijatinebanot.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/vokusewekafuwupejipop.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/75625859421.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mevotijofosarolifikinexo.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/kekew.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/83496811918.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/vafitetabegudigogikapev.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614563bf1d9e7---56483373738.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/46567493610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+install+twrp+recovery+with+odinPDF 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_off0000b476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB476 17920 bytes
SHA-256: 918fd2ce4e68e960d0061aa8de1074c73d6bed0bef8425bc015a925a8d3b0a43
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10868 bytes
SHA-256: 4d9843ec82e5921281b331225833c06760b8adb7563eab44dc8c8346a7fb1259