Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5266b38a1ffac51…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 06:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0af8cff6a85be3b16c82e10de607a1b8 SHA-1: 9264b8bf46924bce39ca30571052546bb6ce86ed SHA-256: d5266b38a1ffac51faf64bd7fe336b25808b94453f4b4ee44000b54d9c8cda45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing campaign, leveraging a visual download button and embedding numerous links to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a second-stage payload. No scripts were extracted, but the embedded URLs and link farm structure suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=android+studio+xml+templates+free+download PDF link annotation
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a95467a26---xobapupebojo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143f14a13043---lovigosexowetuvigelesuxit.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/retobijobetogoz.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/97848918037.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/14493103996.pdfIn PDF document text
    • http://secretinvitation.net/images/files/jamebitufagiwog.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b669121a825895f003ae33df3713f9c4/66229474544.pdfIn PDF document text
    • http://micruts.org/userfiles/file/68404702319.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/wapivibovusezugemisaleniw.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/tegajulewogeveterof.pdfIn PDF document text
    • http://imaginove.eu/data/Files/14423725257.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/zulodojepupo.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gomupo.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/bisekubusezijixogadimu.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/34022229208.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613099926f947---modevuzimobalama.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/92d9f81a4223a83435cd0cad28464c73/49329318061.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/savigukenikifege.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f62486bfa---wixapikubutixepurap.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/pojogomedapiva.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/zimomagitopovapolefu.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091417461342.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161394554a3b18---45417184785.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/49602635583.pdfIn PDF document text
    • http://abwessex.com/uploads/files/65187338908.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j0s8htk0rbtf1ff12bs13vo4t2/zupivosezivudufinagazel.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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 10928 bytes
SHA-256: 1f9d7eb0ac2543a4b9169eb651177ab2a6e6e19ada056c347a37bdd811e69cdd
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 16376 bytes
SHA-256: 51fbab698e9f35122fbef1da44bd21932f627b355d32dd53814e853ef875e7b9