Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5bf188990a799d…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 16:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 80c7fb2f2abff7a27259796807471d33 SHA-1: 41d256e80acf84ea51efacfdc721d44e62fad0c3 SHA-256: ce5bf188990a799df6def3071a2ed8a3b377e8c9a16e2a59e90047b1bf77889f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=one+direction+wallpaper+for+android PDF link annotation
    • http://tweddlefoto.com/files_contenidos/upload/files/fekovan.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/39368225500.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/mifonidowi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fffda3675---40256757855.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/92983495209.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/jisogerutal.pdfIn PDF document text
    • http://ha-sine.com/d/files/87965746075.pdfIn PDF document text
    • https://bunianco.com/other_files/File/konazisaxa.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/navesad.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/susoxa.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/43017766300.pdfIn PDF document text
    • http://symbolfoods.com/files/file///61921508939.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/wosofovobigudawafumugamu.pdfIn PDF document text
    • http://ecole.ru/text/images/file/59346089975.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/xoxijizosobafasidafepege.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/jufiwomiduledazolekitexez.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46c7f2f4a---40877181981.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/vodegutemugogiriju.pdfIn PDF document text
    • http://btfa.tw/upload/files/xaligaludipo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7bc6094f7b8fe5bd6d9d90f175bb7df5/fedewidipo.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/sapifasitu.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/6999754893.pdfIn PDF document text
    • http://sin-hua.org/userfiles/legasoromebilanosemo.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/50655443900.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_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 15964 bytes
SHA-256: 66f6c759d60734d64623526a385f6e8a099a8e55c2636031ea8f208d279862aa
font_01_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 10556 bytes
SHA-256: 13f9af78f9243d54564cba04e4a6edafb1389536446664aa6c9e93ba10f54284
font_02_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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