Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed05a618550bf4e9…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 21:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78014d13eb4bcda48945b6edcd5683c0 SHA-1: aa980d0783915c47577f20bbf89e58de00fb5771 SHA-256: ed05a618550bf4e9ba60bf2caeaf581420a3e6d4aec3ccc8b8966a8faa339019
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=how+important+are+communication+skills+in+project+management+pdf PDF link annotation
    • http://toyotaquangninh.org/data/dulieu/files/vajolibid.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/35892821505.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16097657a91d21---gasapexigoveku.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/xejomuwaj.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/44272803248.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a2828f81---pinobobabuzojaxis.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/200ab6826c4acde16d08f7acd6aa0be8/zojuwukarebafobenajakig.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/6541296992.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/mujano.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tuzobepivavoborasuzo.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/83523194596.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e04dab83d8---vugikitokokeloge.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/35676713375.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/nipesenuzagudomijesike.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/4858801524.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ddb2264d4---damiwod.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/kuvavunokobarulu.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pugasesixeribarasixa.pdfIn PDF document text
    • https://airshow-bg.com/file/botimixok.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/xewepixekukuwipar.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210806_055FA639C1BF7E12.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1dce8488---64738940595.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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 17648 bytes
SHA-256: 95690f97c3c9e12d974d8fa2cdba2e31b06a1a5630e5a57dc40d295f487c7995
font_02_sfnt_off00013968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13968 11364 bytes
SHA-256: 4c9abf1a0b1cd47bd202639da87e52d335bfaec515b4cea6872f8812fb543125

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