Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fe49711fdce591…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 13:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ad5baee363dadb3d1d3779d911d80b2 SHA-1: 673aef7d01e66ee25ffa9080989dbb8825a51b75 SHA-256: e0fe49711fdce591f2f883766fe729de18109e518a1110c483247d5be07bcb1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple external URIs and a link farm structure suggests an attempt to direct users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://claudiamelchior.it/images/file/pamekuzeto.pdf In PDF document text
    • http://clickvay.com/upload/files/xukisizapor.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/79177541194.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/82626026592.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/vomurakoxijinejob.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb101cdd68---dojenu.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/zobab.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/16071770497.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/guvikomajami.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/batako.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/34185698145.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/relanapewogodowuko.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/65461179536.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/47629437259.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/85265038797.pdfIn PDF document text
    • https://geniodelweb.com/file/nomafetekupigev.pdfIn PDF document text
    • https://ratosatu.com/contents/files/sonejoruwekotidu.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/gifejulogojopumaver.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132872295b5e---sezotuzumigibabojebujatav.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/gusopikovidokudidubiz.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/jajebeverifemilev.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/12110541914.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/26542129098.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c4437d73---76898003092.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/59248299396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=365+outlook+sign+in+emailPDF 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_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 17688 bytes
SHA-256: b8dc40cf98ee56cf0162b88e9f3a51b3a0e970eaa82b16435229dd3998977289
font_02_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 10920 bytes
SHA-256: 1e92ae889f8ba25043165a296d90b353a8d3818a9c250fed9ad61d7dfd759725

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