Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45ffe80594a8174…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 06:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b79d09b39164e5467ab13f2290f8974 SHA-1: 7ad7356c7d4a1b97674df0c5e59eb99258be7adc SHA-256: d45ffe80594a8174a65e75b576663e33e47b3de5ee6b41a4f126d86f3cf1c703
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristics indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings. The ML classifier and ClamAV detection strongly support the malicious nature of this file, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://apvn.info/userfiles/file/pezobor.pdf In PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/jogulojixitegetar.pdfIn PDF document text
    • http://santehnika34.ru/images/file/88264092528.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vufegikusopusisoduni.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613863ad2d5f2---1296951265.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/22078884168.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/bononodizikopexeju.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d8b89476cf64127ede9c5db622ec0ec4/siretobenavijezilesisofub.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/rebom.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/xitafofaluwowawejubal.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/47456076887.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/43604679238.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/62909111977.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sujelenorira.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/98223029283.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/42159242478.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zejizekutipogegeno.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/gavigoguxagumezen.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/86926100503.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6289dec6b8276fccfdf9e76229b8c524/lemireguxurawibejidafojet.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/47416724910.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/melezesalixejopopebowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=unturned+best+backpack+idPDF 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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 18224 bytes
SHA-256: 3c881a9a8a5ef1187115d1adeac38aa481cf100de3306d50bd4d517433073647
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 10680 bytes
SHA-256: df1282e367632815da3695e2262d89ae8a7da054d7c37d2217078d5ee3bd2f56

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