Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ac1953da3384a2…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 13:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81c667c303fcb95f37ff940dc1b94c0a SHA-1: a3279dc9fd5cd2711c63760700b592e415fdf511 SHA-256: 85ac1953da3384a282db249fe6f1320ba03e90804bed39dd9592f9b58cd306f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=babyletto+mercer+crib+manual PDF link annotation
    • http://datong-travel.tw/upload/ckeditor/files/20210801145322.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/748d7c45d55e4fb2aac3bbecbd7c3a9d/52376869735.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772359b52a3---18223802841.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f0686a54---maxozuvupivo.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/sazadamezifagilojog.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2b373a17945e3a3996d0d38eb14af87/16852375558.pdfIn PDF document text
    • http://vtaky.sk/media/file/22128072541.pdfIn PDF document text
    • https://eternalbliss.net/file/jorudefobilifulepe.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d67330682e42aadd90d1570caf035cda/10763062418.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/ninetapiraj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee85772acd8---20139835648.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6cc2i7sjh35os5bn2umqt7mrg5/xabevudonanoja.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864368afa6f---11679748243.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/nm91vb00beuor534fdptnismq1/69126464297.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160793a97d7056---34131794765.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/jepezoxerurevinakopida.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326279c0695---damerij.pdfIn PDF document text
    • http://stevis.cz/files/file/96899798981.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/v31iaqnhiuublpl888c46i7rp0/43997430538.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-20/20210620201829885675.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/poben.pdfIn PDF document text
    • https://orrizon.ru/images/file/runefukolete.pdfIn PDF document text
    • http://muszempilla.com/files/file/vubini.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/15424247436.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/nejazewogapixemunojafal.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_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 16892 bytes
SHA-256: ed735a1a4713963f7d5ca567e186e0b61a9fbdbe515ae384d3df5ee7a7e573b9
font_01_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 10632 bytes
SHA-256: 2ef94d123d39b9de38503125aa93a1a10279762560fa5c6133615abfba888b17
font_02_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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