Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a1a629c8e72b30…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 11:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8cb0b4f16962cc03e023f8850a23fbd5 SHA-1: fb0453f0de2db819d1a77cb56897acbbb7a7ac3f SHA-256: 65a1a629c8e72b305a88c1084e5853bd9846c2545dde9a5ee0572867b062e2bb
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kanchanaspa.com/ckfinder/userfiles/files/faviletirilejuza.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a0bedbe20b00d1691f1fdffddad5757a/dedudibagaxu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b898e06f5d84d5e5a4f53cf93fc6b1c1/maburusepomemimesudumuno.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/giwujus.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/kakizunovenimesofux.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414eae9034---wupixipudagumewuxu.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/dakonaleboladeviliwezi.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/10332049514.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/jilusuxo.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210909064957.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/dixobuwotesexozereruxaf.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/milod.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/80169975898.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/27577047145.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/081d7c55e491b8fe94398928f981256d/nijije.pdfIn PDF document text
    • http://fpole.ru/sadm_files/75412764813.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/92769987853.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/tafojosupenadujopavujaj.pdfIn PDF document text
    • https://33mobility.net/uploads/files/33711322265.pdfIn PDF document text
    • http://autoandtruckrepair.net/nbloom/fckuploads/file/51299114422.pdfIn PDF document text
    • http://mc-opony.pl/files/file/71204332379.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/14040245849.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/49654505735.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bokanerutosuwaposoxegakiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+super+mega+fire+red+download+gba+emulatorPDF 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_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 18096 bytes
SHA-256: 3021b18a3e1b09003960467dcd7bbcc0df3dc47fbb3e60fdb4d296caeafbd81c
font_01_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 11260 bytes
SHA-256: 09fe512549c0b562283c15a28e8713dd674a60dffade28c88a2f1450f8bde1d3
font_02_sfnt_off00013f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1