Malicious PDF — malware analysis report

Static analysis result for SHA-256 0228fec017281e9c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 09:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 163221d5bd5ab7ce804673bae0c4c9e9 SHA-1: a0befc2c259f801917ec0a2bf6cb22d8e1e800bc SHA-256: 0228fec017281e9c9423515d4bcecd09475828a429b69032f035eddc791e9420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://harissarantis.com/userfiles/files/84147252049.pdf In PDF document text
    • https://vespaclubcagliari.com/userfiles/file/setakegifuxepixixe.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/foregotisabizipowik.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/wobazididurojugelumot.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/rutonovejovidebemim.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09fbabff3---pikojikeweporegumodusena.pdfIn PDF document text
    • http://perksys.com/userfiles/file/salifubeteroruxiguwez.pdfIn PDF document text
    • http://darstin.com/userfiles/files/21686060551.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/90931743060.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/fomisojazavoxafezedifevo.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/pavutet.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/12719840373.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/fekikax.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hpbc43khgmujgf2ui9polrigfr/posas.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/64358017917.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82902882492.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/zowajexokukafizumabamij.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/velutezepamipixeki.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xerixarega.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/88808607429.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906023211_1694938745.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/vudozapixubusasadogejokez.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b73e718a482b55731f4d2fde4591cc19/mopafovawen.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d4dba987---nugumin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chrome+cast+to+android+tvPDF 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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 17824 bytes
SHA-256: 2049619465bd6a142d2468ae8d54439a067b13ca7a1ad6780a49b9e8e9ab2fbf
font_01_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 10688 bytes
SHA-256: bc105d1109c752d1c75df1d7a2decc91a3225cd00d6b39caf6476c6b07a00b62

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