Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcea90b5f74f36ac…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 03:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65b738b2a14abccacc73aeb5ae045188 SHA-1: 4c3118eeffda94552817011a79f032508c80dba1 SHA-256: fcea90b5f74f36ac527261ffc21204c9771b768f72f9a19d018e3ac0d1772744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=racing+in+car+2020+mod+apk PDF link annotation
    • http://studiogiamberardino.it/userfiles/files/86802552547.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109082038567957.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/50879480783.pdfIn PDF document text
    • https://qnzar.com/files/gagunazewexovugegubizivo.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/59176603555.pdfIn PDF document text
    • http://aa-nusd.jp/wajesapenimotejuxed.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/tefave.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/77159490312.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/62071010758.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210908215746_ha26s2.pdfIn PDF document text
    • https://baptistfriends.org/media/rizap.pdfIn PDF document text
    • https://sapporopools.com/contents/files/vowoni.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6ad534e4---kuluropatava.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5b75f0979359e8be304b3a16145d5799/lixurotiteguwevezimebodo.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/foserolarupikovap.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/buzufetovifibetaligema.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/witifulukuperinivi.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/5530677958.pdfIn PDF document text
    • http://tai-group.com/upload/files/tinetosubogaxijibatolo.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/jefugol.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e607a7dee4---61012620325.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/23192158128.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/88918766157.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xopovebawebemile.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/polamusifoxade.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/vedoxulolukovidimoke.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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 16540 bytes
SHA-256: bbe4322e8048ab33160b948d92610ff24eb88f831e8a8666c5d5530922d249e3
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 10792 bytes
SHA-256: cdb51fdd3c04cb42b8bdaecf45393c83101f189e78d486305b3b882165b530ba
font_02_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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