Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a6a9ad5ce4c24c…

MALICIOUS

PDF

99.0 KB Created: 2021-09-06 08:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f51bd5fa9358a4ae3d88bd888e76ef0a SHA-1: 34860efce9a347c1e628f6bfc850033e48886f72 SHA-256: d9a6a9ad5ce4c24cd5fa36406e3b1a9f5fbc075da75ebe1ac08c782ec61770f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://bsbcarpet.com/userfiles/file/63888248380.pdf In PDF document text
    • http://hosvagyok.hu/userfiles/file/pejagapugasak.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmp3gfi5d9gekqlcfd50lduq2m/nepoxonokezato.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/jelekokasanetufufeniza.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/jobituvufozo.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/57806545178.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2adbb82245---25116740396.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/86120218864.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf03ae879---wutevolepasixodizat.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094850254ced---45324941725.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/23740939964.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/mumexanafomatuxadol.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/dufujitenizolugulofopugek.pdfIn PDF document text
    • https://pellevah.com/upload/files/turomegomisajarijaru.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0990212d5---56485121696.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/69464731021.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/88a5fa841caa86934179af8645da60af/ludemilufepajukojofo.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/xukisapeketaluvigip.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/munumediziramite.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/68127955009.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759bd79cc30---gigegugajenux.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/jinixatapuniroperuxefi.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/64124872991.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g6reull09b36fm3uhu7f3bouha/147320786.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/96168492920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=social+strain+theory+pdfPDF 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_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001363a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363A 18320 bytes
SHA-256: bc6bf21c0a526335816df71cc1b26481178f1c7cba364d1ba013ca8762e1e4b0
font_02_sfnt_off00016592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16592 10908 bytes
SHA-256: 16cf9f43459881d9ecf7d33eea40368e418cfc5cffcf3189993b72fc33c2fcd2

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