Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a24903bcba45ba2…

MALICIOUS

PDF

87.5 KB Created: 2021-09-15 21:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54bfb6e675ebfc5b63dac3cc1b847069 SHA-1: a4d95bff510af21c1e4543a97f8d3a640ab79947 SHA-256: 8a24903bcba45ba2ca90adf8c9c8d02a1a677fef17a66573dc5a6ecd1c393844
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive recovery information, a common phishing tactic. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/of9u2341uch2ato6gni737k9nl/rawebejizo.pdf In PDF document text
    • https://advantage.ee/media/contents/file/barasavuzobirabasojijinob.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/fibavozenarerulokezevid.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/duwalujuzodumuvoxotowofe.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905010450.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/34021227017.pdfIn PDF document text
    • http://klpa.net/userData/board/file/80061948031.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/gemimalorugapotegizut.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-09/9eaa91925bd81513b963abcc7ead99a1.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/pisamewun.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/38911090390.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/87830419735.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/lajapunimakozaxalobud.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/83184330014.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b244313cfcd29f6256a211a0a0426f1a/tavuwafusumevinerateza.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210913040930.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_0C7FF4A698A2C963.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/fitugijepejiteru.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090404503065933.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374b0d43bb9---4796049911.pdfIn PDF document text
    • http://jinyezi.cn/upload/42030487373.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908174711869175.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/80690358322.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/bajabotimezages.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/19279852547.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/96945793906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=instagram+auto+liker+free+without+loginPDF 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_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 18164 bytes
SHA-256: 0155ad4c5341dfbdbcf5555d023c8cd9c42c0da8d5518801d2ced4133deff677
font_01_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 10888 bytes
SHA-256: dd3dc9b4076c40a69cd5cf0d10c632a4fdffeb6c7b21e558338fea80db50af83