Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14610eb4605c1d5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 13:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11d30d3517b78d716b5c81d786a91f10 SHA-1: 2c59d1559c280bc4a5b74be29571fdea9aead69b SHA-256: b14610eb4605c1d5d59deae04933a1aaad71bbde96fd614eafd72ab17e5153eb
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. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

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.
  • 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 http://paitoonbox.com/userfiles/files/kutekuxovaloz.pdf In PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rubopimemujowek.pdfIn PDF document text
    • http://esistore.com/userfiles/file/88286768408.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/zabita.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/42480034636.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/riwawalinivukilezikemu.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/12251957684.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/36801190380.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613087035e95c---27039468750.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/94553269304.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/jojebujomujixawom.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/181630732.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/18713222895.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161324f1e02a8c---20925609387.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/37654750535.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/730c6ddbdd297cfa8d1ecb82e0767cf4/69097128351.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/39072854458.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/donubazasupup.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/kupejomipoxodotagi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/7697767996.pdfIn PDF document text
    • http://entrackintl.com/uploads/bapetewi.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/60007840804.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/20e51e383e41d6df18523658408d033f/64077400335.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/lipusigute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nova+3+for+android+apkPDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 10356 bytes
SHA-256: 8810728b0114bc64f61f46287aa192dd121675be15338b878c23b3bc44067c3b
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 17688 bytes
SHA-256: 853b12be064a89747f5a90f05d8ec4bb0eef0694163a5417c7353f7d25802f1e
font_02_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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