Malicious PDF — malware analysis report

Static analysis result for SHA-256 7974328c99300b46…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 16:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9defa88d833e3156df37010b283cac42 SHA-1: b159f4c4f4043cab11f34b996f619feb66f48ceb SHA-256: 7974328c99300b4663e84ca8dfbd93ac838997166acd4106e606052609896be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=logan+2017+watch+online PDF link annotation
    • http://mnarch.it/userfiles/files/66870791962.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/53264905838.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/97290081179.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/62446268660.pdfIn PDF document text
    • http://standdominica.org/files/files/77811545247.pdfIn PDF document text
    • http://exim5.hu/_user/file/niguzagidoxitesa.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vitugunizuxepupipa.pdfIn PDF document text
    • http://health-bridge.in/upload/file/sixujesilasalawixatewog.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/97234638257.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/10779776121.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/96096095724.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/59457896278.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be3d8cecb---70859481466.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ec4md8i4ivcl7qttmf5jl9eepg/jotamebugirojuxiw.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/33729006980.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/46911982762.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/biparimofekutefopizu.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/19659724934.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/62762678738.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/59796063533.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210914_02817E0E1F29E3CA.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/43171849204.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/vaguvuwaxekaw.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ccbd90d7---34452125608.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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 18168 bytes
SHA-256: 00f36f92fe1d5f105999f59be58e23b2fc29b748c66c931a96cae624b3ad9110
font_01_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 10628 bytes
SHA-256: f2ea06fb9d43fc4a3a0f5984df9eda5f2712614a98490dd9e4f980eda88701d3
font_02_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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