Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55bfa73da81d40e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-02 10:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56fb2f70caa633bb00c9172863360752 SHA-1: 634ddf3c0d32c9f0eeb8a277eb686b4881cf737d SHA-256: e55bfa73da81d40e65c16be9bb6d06437a3d290bd72e3d4b6f4fcccc0a07053f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=fishing+for+strippers PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071b157c57b6---296212759.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/23011572418.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/benugilawaludeperasamuw.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/15418980002.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6639f1ad---62084538487.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70493e4d08---86539939464.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/zofujimexozetab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3f54d4e6---40770897612.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/pevesofebifanu.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/pigolekuwosenegewoluxaza.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/93270137099.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/73293383299.pdfIn PDF document text
    • https://biocoils.com/img/file/46941929392.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84903664608.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/zugikewesejumozi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4deb66d86949e41c7f08c4f81530b645/19518376443.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/jakesul.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/eb26da20ece2c345658904bc4eac1ce0/jolilun.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021053022535380554.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a0bb95040dec3b61ef0b1f8853d5fc9f/dadobene.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/76903213780.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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 10408 bytes
SHA-256: 5bfeb30e70df37842ba6960d418b0e81251f39436f40da148a1a5bda659f333e
font_02_sfnt_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 15000 bytes
SHA-256: 051879b9a9e160ac92a3aae5e5b182bf6e8a2c77018b4d79cf51ccba0a979750

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