Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f28a9b93dd7486…

MALICIOUS

PDF

81.4 KB Created: 2021-08-27 15:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50aa08d19e66e73acd6726ad22ac2ba3 SHA-1: e964704e12ff61cb4404d0e5adc333cbf6a336e5 SHA-256: b6f28a9b93dd7486ca3bd38bf6987c424dca68bf7ffaa0e1aa2fec5aeb8f458b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/uplcv?utm_term=god%27s+perfect+time+verse PDF link annotation
    • http://impressivetravelvietnam.com/upload/files/fomewimekejipewadazo.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/fevutelukeva.pdfIn PDF document text
    • http://ore-processing.ru/d/files/56976278800.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/46241158716.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084708323dc2---15906392769.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/32761378323.pdfIn PDF document text
    • http://beta-rc.com/upload/files/59741815038.pdfIn PDF document text
    • http://www.bash.cl/media/file/8981501145.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984556ca565---zisukifupudovosemavapa.pdfIn PDF document text
    • http://congtyvima.com/images/Download/nakejutagidoferesojo.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/zapovebadezewuforira.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609460f5425d8---2983357812.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/34782125951.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/tifijirilukigo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/e5e94ef7ab96ea7ed422bca9cfcf2fb2/suvobudilonukemule.pdfIn PDF document text
    • http://abnicum.com/files/file/69609738381.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc323c644f---soxepulumegagiwi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/92391826466.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/parebug.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/56278749202.pdfIn PDF document text
    • http://3sdent.com/upload/files/6344993281.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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 10608 bytes
SHA-256: ce4744af55c5d16156b74f9f52bcca7ed444712909309c2323ef667417d6036a
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 17900 bytes
SHA-256: ddd2ff78550f669ceb5ca3288ebf4cf067c148128a0b54511c04fc34f1814926