Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f6efc4dcb8003b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 08:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57bf45be5fcd8eff30b99c891a3637ac SHA-1: 075453a8e11d706f9cad4b69e0be789b8906118d SHA-256: f5f6efc4dcb8003be3a4f357c64284830f1ae0fe71669e442f87b63178ec70c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious and a link farm, with a high ML score and ClamAV detection. It contains numerous external URIs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=pubg+lite+100mb PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6e5a5bf0df3d22013a604ec97097a14f/renofapuwusap.pdfIn PDF document text
    • http://plncse.hu/php_data/file/lorute.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8ceffcc1f5538847ef076f808b64e5b6/falox.pdfIn PDF document text
    • http://net-marketing.hu/images/files/xebanolesanutivimalegu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uh7v7jt6rnbjuoqe3a6iejdqe6/8803815248.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109030227481622.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/62133201016.pdfIn PDF document text
    • http://woykoff.hu/upload/file/mufuxuvepozora.pdfIn PDF document text
    • https://susta.vn/userfiles/file/49707273023.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/badedivepozowagirud.pdfIn PDF document text
    • http://langmypham.com/luutru/files/21466602215.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/renimexox.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/lenivakasof.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/vikonufatikavokaxasefud.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/gubibopezi.pdfIn PDF document text
    • http://intertravel.hu/_user/file/37304982707.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/27854382920.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/52467765270.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/fapoz.pdfIn PDF document text
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/fazeboxolewiw.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/tatafuzu.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/mufazisova.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/98070043375.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_off0000c2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 17616 bytes
SHA-256: d976d81d534274e0501e01fc0c280812e90f39c7385bea9bf5f6874e15e99a62
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 10212 bytes
SHA-256: b3b6d16bccb19161ad8c464e1c68af90f01cf391c76c91c87dc2405895fae247
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1