Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d5e249b67804a9…

MALICIOUS

PDF

94.0 KB Created: 2021-08-09 23:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9127fd77ce2cb4c17698cdd561a99ea4 SHA-1: f142d34e8e11caab6f9d94c2a5c2eec6cf7e920c SHA-256: 77d5e249b67804a9428b2d5d3bd1941583b43cca2ad527010b29d7d0436d3858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=preguntas+y+respuestas+de+la+lectura+una+rosa+para+emily PDF link annotation
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/pganh6uaiudh7coiq0cr48qipd/tasakek.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/lizom.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gadenigepoxusezizur.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c10e33f187---49133291591.pdfIn PDF document text
    • http://etre-belle.su/images/file/23910732383.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/5906238061.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//32313361688.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/povadofakumudep.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/webefaraparomopufos.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/38588600534.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fogiwariwuzajorada.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/70354233027.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dj7hrf52mld7e1uuk67aiki1d4/mupipamadiwosixorominul.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/59134161041.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed793086885---durapetajafifuref.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/7546543226.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1daab780---doroduruxojozogomod.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/nidapatudijafumefowot.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/maxadik.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e4c262f4a---35927791113.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/dusomuniborejavotoja.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_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 18176 bytes
SHA-256: 73c276b92282ff0870ca57129e2054a0cd161c8c4a264d52002253bf76d5037d
font_01_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 11072 bytes
SHA-256: f3a6fb3c2c321694d5953f86f3724cbd7717dfe6362b4f38d0a0ee0bf815eccf
font_02_sfnt_off00014f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1