Malicious PDF — malware analysis report

Static analysis result for SHA-256 25663c076fedf0eb…

MALICIOUS

PDF

90.5 KB Created: 2021-10-09 05:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dfe0f687bd86f2fe0beab9e640a0c9d8 SHA-1: 5f099a2a0ba1f3c85bdc4c1d13a3b814425fd563 SHA-256: 25663c076fedf0eb1adcceddd4108e161bd4f449cfe03b8814098e131a42a9d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+unblock+a+puk+blocked+sim+card PDF link annotation
    • http://inarchengineering.it/userfiles/files/65909746789.pdfIn PDF document text
    • https://anaksemut.com/contents/files/noxine.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/rogotuxife.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/75713623207.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202110081158176636.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/6054343774.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/texafexumu.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/mafugadafosufovedudunud.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161399c843af68---28845853180.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/87555181935.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/29743721991.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/wobapinimawidabovulewozug.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/74d847d04c23462a2162c574bc9fd1a4/zilofimobexekov.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/10876136546.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161568c71b238b---49305035090.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/tukegosatop.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/piwawavap.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614843006b758---17568531721.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/5195838733.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/wapixiveranelid.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/zifidaxomamoduj.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/sanuvikodubezaj.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/82248078593.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_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 11084 bytes
SHA-256: a34e4db93c9dc0fd968d2c6a9dac52a949147580a151cf46669986ee1a5a21a8
font_02_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 19408 bytes
SHA-256: 34e4449ba5cf5a0d47a4610e4987584d6ed7d038f7ed32bd296c71a1bcebd91f