Malicious PDF — malware analysis report

Static analysis result for SHA-256 4168a4007acb2f18…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 17:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a695c8f56f36d6b7a4425dded198403a SHA-1: 878d8af907446364fcc610fbe5d914262ad48340 SHA-256: 4168a4007acb2f180f0e468f709373d66c7aeffbf676bf6cba87d5bee139dbdd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and links to external URLs, some of which are hosted on compromised WordPress sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing a browser extension or update. The embedded JavaScript and the nature of the links suggest it may download and execute a second-stage payload, aligning with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/3624435765.pdf In PDF document text
    • https://akamercedes.com/images/uploads/files/dowoforepitowu.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/20071330304.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/fisagakagilakujusan.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/p0vrki5bjflbug5nq5chm70a3j/fogap.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/34030774519.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161374e3678b32---begoxowefovowulonazo.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904205309622042.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/33372585191.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/91217827057.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/sinimok.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/37995693849.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/14eb868602ba2e26cbb18b5b5f0a5f8d/9117258369.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fepobenewev.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/18857178920.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/rukumalakugukiluzogofab.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/teduzebipikutofe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14ecc3f93---tutuv.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/43103743140.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/32194103037.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/67546757710.pdfIn PDF document text
    • https://blogsma.com/files/69025100829.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/danafekesik.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/73617915446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=powerful+browser+for+androidPDF 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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 17356 bytes
SHA-256: 0d2ac40a4a5b5a52bef0e1ba188660f7d4231adc5f9d73ba72105da2c8fd1d3e
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 10576 bytes
SHA-256: 76d6b552308d4198125652e7eb4fbf96307cac73c75e2a6540eef234b552e359

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