Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a62d09ada6b73a1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 12:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c32b4655ca0c3ebb938d73a39010582 SHA-1: dfacb614d0a9563935254652b1568d0cd898ca00 SHA-256: 8a62d09ada6b73a1a447dce53e74984fb6fe751f042ea2800e001b5e46d7f229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites 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 https://pixomot.ru/uplcv?utm_term=fk+kernel+manager+apk PDF link annotation
    • http://csc0512.com/userfiles/file/20210908155614_a0bl8m.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/nejepojow.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161301c1896b4c---kulavokiwuzedet.pdfIn PDF document text
    • http://www.centralperdana.com/file/kivadusujupez.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903205626997996.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mapejusig.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/33277201372.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/49224452726.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/8349030920.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/22455222101.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/fewidezabuxir.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135159b08692---foxazukujonuvaditokebo.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/4243208076.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26157ffa4---79577608436.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/10669466302.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zidifewirarub.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/porixopag.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e91138d5a37d5d84bda9d1f3cf0830d7/8977373632.pdfIn PDF document text
    • https://t2sc.me/userfiles/14174218056.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/bipobagopurijiposenodo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-6/20210906194658461430.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/kidujasolumoduju.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/92181699412.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/makaxevin.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/73252380681.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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 20104 bytes
SHA-256: c6e68e366af5cc8e33f5d15326cb8246974475395524e5c1f31c7c010e6f7369
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10188 bytes
SHA-256: 2a5747d2a6b39f024ee79c275e1c0061a971ea9d4ad034e518f8ec72aefb1810

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