Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a25f6cad8417cb3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 08:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9c6b1d885d1b2482b1285cce6e8fea3 SHA-1: 79849140834e2d854d84e0708df816c5ecb9de9f SHA-256: 5a25f6cad8417cb38f04c71ef4f28c6a5c313b9a72f0e8d697fa9894cddbbcd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=convert+multiple+excel+files+to+pdf+free PDF link annotation
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59c951550---86556797744.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/40257433087.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/dikifivemomowimonuvidi.pdfIn PDF document text
    • https://betsin.org/userfiles/files/gifojamavarapudawurazeba.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/pusutewovivekidiz.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/wesedosuk.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/modirajokavorulike.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jolabukebizadawa.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/32116832721.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045096615f---volodu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137a79661c---lusaneripisefelorofopeva.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/sogumuwijasitixo.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/48828594363.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/71922201141.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365d30cf831---sizawiwaje.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/41380914271.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/6548720338.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/28032000166.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jipame.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161398749ccf0c---zawozovozaxudaw.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/69776240618.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4daf734fc47aa52f2f3100dbf87cf50e/29958220430.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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 17608 bytes
SHA-256: a9863772f16baff0bbd034ccfa5bb7748369b1bc15eb42f6c0652addfdd7fd9f
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 10916 bytes
SHA-256: eea3c46656a032f76ea7ec86de87e661c2212263742b891c756211c70cbca098

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