Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4c44a589d2a31…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 15:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56ec4f5fb018996c5ee70cacfff108ba SHA-1: eb8b3ef9d6880ba742d122827180afa6d0f1fb1c SHA-256: 72f4c44a589d2a31ac9f313d4e881a502a6d3bb53160f2240719d18c7695698b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. Embedded JavaScript streams are present, suggesting the potential for further malicious actions such as phishing or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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://bankkartya.hu/js/ckfinder/userfiles/files/genofegoduje.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/fodor.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/do43e8q0kuqe2n7763io3vbmeo/judofoteloteli.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/70698841246.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/rilisabuxonesisewukexo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3d9bbe81419b8729cf2f25ecb54a6fd5/kivatovatazutijipugix.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/914b4a92016bc3c7ac9ce4c16292b4f4/maduzinelikoxejegusog.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0s28hvtt8ce21nuju0igi0ft76/51691579817.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096330317296---josifuzoxirewafidesev.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/lusudovir.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b90d6b47---85949847214.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tewedumu.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/zufefugexizu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdabaa8b4bf---52026773356.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/da0734a3c20b65affab60caaa9a26aa3/sesimisobuwawegaruxa.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/nesamulad.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bomigoxosezifa.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/fapes.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/30379335561.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78ccb19e64---rovega.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/busexegigisatobawe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757a634bb8d---75122739944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=four+types+of+economic+system+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_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 10764 bytes
SHA-256: bd3b6be6049260369be0a97ce3584f6775386b54d9e49cef2dbb7e58fe98bda9
font_01_sfnt_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16624 bytes
SHA-256: 3592d8f23e7ec6121b55e708b8dccd22138769c4df7d7af9079dcd4be84b4797
font_02_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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