Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7c960b9fa06d9e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 02:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f5d8bf020c18e46874676e7dc21df67 SHA-1: cf5c63031e74b6e207144b1828cdc3e14ef7acc7 SHA-256: 5c7c960b9fa06d9e5f57c5daaac1ff78ff06e3e5c70f45086a8d0fed9b342901
164 Risk Score

Malware Insights

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

The PDF contains JavaScript that likely redirects the user to a series of URLs hosted on various domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. The embedded JavaScript is the primary mechanism for executing the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://baoholaodong24.com/userfiles/file/73939318142.pdf In PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/nuwerit.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb474d9041---98524123689.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/devamusevizosivejuxozube.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/toviwofubo.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/lokejorojupomo.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/kewot.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/62812888132.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/s7t6ml17f4a2qbs3deb9fcrt63/volupefemukigakagakob.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/58632471918.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zipeze.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/vefazi.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/mepukumozefogaxojum.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/8132184532.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vizor.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/72899726645.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0133a83841e819d8cefa2fd85915a508/42543808951.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/44290983982.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/kanevofapexinobabuzalo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/kasezetunom.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/68451822678.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/39700520798.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nelaruwodofilevajir.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/kigewubidigejilasakod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=complete+organic+chemistry+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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 18152 bytes
SHA-256: bd6324018af4695b48055dfefb096fd19b19a3795ef8a2c30551b117d9873f40
font_02_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 11212 bytes
SHA-256: cb5ecfe0d3070d967edb4f4b624681d1db5b14afeeea44987ebdcff2c5135adb

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