Malicious PDF — malware analysis report

Static analysis result for SHA-256 4649ac2ac37ce0d5…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 21:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0fa43630f92a58635541796c5965b93e SHA-1: 4d7c03b4a4f4856e58f1c081d53ff754bba8510d SHA-256: 4649ac2ac37ce0d582a26e1c13bd76c3d4f6c4e3e41b12cbc50e02a6bb19396b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous external URIs, many of which are associated with compromised or disposable domains, reinforces the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://parokisantolukas.org/Uploads/userfiles/files/nubakiw.pdf In PDF document text
    • http://bright-inter.com/file_media/file_image/file/59511386342.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/zitetolip.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/11728763066.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/19412132161.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160889d890d51f---80613599157.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c1bc1d93---97668510613.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607131a66c098---94199538678.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/dajatidu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/64076931840.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c15980a3---45919363697.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/35d45cd73371c68d56cea7a1769b7d33/9558469623.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/75460014845.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e31fa7ef6188e4dd35263553c98e0874/85299998346.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/29048338736.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/71371222359.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62cafbe9ee---96966165518.pdfIn PDF document text
    • https://media-get.com/userfiles/files/sirotiguv.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc726d70ea2---wuduxuburezomezeregexu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160700865dd8c8---81276252961.pdfIn PDF document text
    • https://kermanrooz.com/img/files/28133632801.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/10ce6132e91033802f54f4de77b48e6b/tegapopazadazaser.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/teminoniberikodav.pdfIn PDF document text
    • http://beateromer.com/bilder/file/biraperedofepemonufo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d0c311decc2467b84cfada1b7986d48/xizizasedidazisolelabefok.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/06efdc95fafc337b389325ef9a2cb877/27923002442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=witcher+3+hearts+of+stone+paintingPDF 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_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 10876 bytes
SHA-256: 860893ee28ac32059f060becb19ba5350d166514a72365521d097bd58b0af438
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 17960 bytes
SHA-256: 39bb4ea6f00ce6c692bd36f81b2f8740774b8aab5353821ebc54ee4758e62e05
font_02_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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