Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a714203ae7d45c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 22:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2801d13fa26d3867b8f29a5a8f67660b SHA-1: b8a10588095b74e66c84f9cbc143b3ddf767fd67 SHA-256: b4a714203ae7d45c3391dde1ad3b7b69139dc1bf746d2d2cf70472c688723dc8
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 are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of links on compromised CMS upload storage further supports a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hanauhrova.cz/files/purudukomuzusofepowuxabu.pdf In PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/23717657694.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/50388644047.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/99005487994.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/21960879970.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/34889376874.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/59012173690.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/46898912736.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/88097863341.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/90403625084.pdfIn PDF document text
    • http://wdnederland.nl/file/31910540282.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/57335291828.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/guvadotegabilotiludomina.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/21302465360.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cc37f977---talexetilixe.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bababepeloj.pdfIn PDF document text
    • http://feg.vn/uploads/files/zenunujopevuvaz.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/07ebf730c6b074cfe96e5261ab06a569/mizulamumerasopafixiw.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/94252252401.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/gaxibupaxosidam.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/fexunariw.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc054c294b---muwoz.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jidafelarekokugiler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=skam+france+english+subtitlesPDF 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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 11068 bytes
SHA-256: 7ca2f1e47511de42e497d7b38329b9f65dd2bd54933e726a0bf6869fb9bd0e1e
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 19084 bytes
SHA-256: 6fe51780bd9745efcebb74350d9e34b66ede427394a8cc8b1d993007e0b5f012
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1