Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31cfec450384b2b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 12:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e95cd9c9e8647d0a2f9370753c756de SHA-1: ccd784ea7d6f6c79d28eb1eb87caf62c4a446b3c SHA-256: c31cfec450384b2b1e71a7a0a3fc4c0e042f71cbbf68cfb0d05fac3eaa257b31
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Antivirus Software Disabled

The PDF document contains multiple links to external resources, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document also contains an explicit instruction to disable security software, which is a strong indicator of malicious intent. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=call+of+duty+modern+warfare+3+repack PDF link annotation
    • https://igraonica.me/userfiles/file/51566268758.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dimisepamowiditilokededuw.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xamilagobevekemugikuges.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a95ed78e320231f23a219ef43820cec8/fubujug.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/b112ec48776e08098f5a7c8532cec544.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/terasa.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/luguretopazidotavumibiv.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/sudabigodozilatowil.pdfIn PDF document text
    • https://maymac.info/userfiles/file/63140594240.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/81724494174.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/wukurulosijibasogu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/mexovatoza.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/jugidowedakagilumij.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/36249508998.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109071751004158.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/mawudefezomeribinifujetiw.pdfIn PDF document text
    • http://beijingteye.com/upload/files/koxuxup.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bfb4c6bc529a5f1e453398cdb4ddb109/pisagadawumogibejozade.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/kegutolevevexumidekuxon.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136561fb8f3d---dovedu.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/25307701468.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/pukujawonixegezupareburix.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161401ddd7c0ee---nifipov.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb230f12b---boloxakux.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/22855022476.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1q7uo53itj4489c2ocr64rq67g/92514667257.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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 11116 bytes
SHA-256: 494e7810f62264fc145a42a782855acf4aeb8a3d5a7bbe1914c6c6744ece32c7
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 18680 bytes
SHA-256: 749ad88da0353525f243ed14e1226df71d774fc245e9fe1bf4dde5346bfb3479