Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7674c4fbcf074c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 09:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d98477f5c642a05808c37ff73448cfbf SHA-1: cfec0798565fabb963ab7a659f0038653a4b4ce7 SHA-256: ce7674c4fbcf074c2796a055d92c47b9baace493c619b0c6d4454a6553322bd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress upload directories or other potentially disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://an-professional.ru/img/files/file/gaxukomurafavija.pdf In PDF document text
    • https://haciendaloscipreses.cl/upload/file/xesumedamo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/luzenigoguzem.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/79314366560.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/53769241283.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3914d639697d573a604aad7524ee2cab/61245472814.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/71839194972.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d215c42c1c8---zixinozutibijepogup.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/51930418767.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/l3c0c9vk1udm3vdestdt144e7u/naroteresenisanuxaniz.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/04be82e884846868814671cfa8cdc55e/tebatotero.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/91ad1f73b59a0f8f976ac2659a94d624/vepitakokosekimojufadava.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/414293223.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/46864750870.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210728_013741.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9d47f32bc5195e5435341258d4effe17/70277710728.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512012133165797.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84030106391.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be44283dd---sitezaboxo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/41978273326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=microprocessor+8085+book+by+ramesh+gaonkar+pdfPDF link annotation
    • 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_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 16840 bytes
SHA-256: 1d1549b1ee66d3885ef362a3f4ccf83b793546a18e8f39b43376c6e13bfcc9a5
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 11724 bytes
SHA-256: e35dac90e115495e430806bdb6d896f4085d2f03ecc773a9d5b296d5978dac71
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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