Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4d2e9c9ef59dbd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 12:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 824933de69eb301a0578fd73bb39747c SHA-1: 01a891625403d99d7ae039051bf15d9e22b1b640 SHA-256: 9d4d2e9c9ef59dbd36e3b04895a9a7db320c4a0e1fa18a8c1afd193589b28444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS uploads. These links likely serve as redirects to phishing sites or malware downloaders. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=bella+5+qt+pressure+cooker+manual PDF link annotation
    • http://oikoscoccatoarchitettura.com/userfiles/files/fomubinoxuxejetutob.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16124b5c6e0c45---jilidapixigigiwowo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/gorunuvetumaba.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04e419537---73070670120.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/tuzamapuduniburojosalidiw.pdfIn PDF document text
    • http://princeverma.in/uploads/files/81797218453.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/wipowetidenudu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/99437382782.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/87083172356.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074285f1e5bd---kemukinux.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/pesad.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/lobuzu.pdfIn PDF document text
    • https://combrooncom.com/contents/files/7474374174.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/79428270385.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/91985492756.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/bugowetulezuwokoto.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7093f62427b2dfa8d0add8cc64bc912/nojikikewesumufeboluf.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/13314741249.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9881d627---xozowosej.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/96447533628.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/28982223338.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3bc8b3f898415ee7ddb443b016df343a/wexizuzosofi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/mufotodefika.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_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 18596 bytes
SHA-256: 814af518dd5bdcd425eb98f93482009252d79a7533755def80975609cb44ba22
font_02_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 10968 bytes
SHA-256: c74d1437cc0dc348b896833b713a2e4455cd5ab32455836d7d48ce322a5c65b1

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