Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c0725a2f5ab4c7…

MALICIOUS

PDF

90.9 KB Created: 2021-07-15 23:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 854b7fde86f7659b78299ccd9b779ead SHA-1: 6724b33df42b8b21d805b3a2b33eb317dd0ed55a SHA-256: 22c0725a2f5ab4c74fde5ca5f2a5e90cb9155587a84c33f164de85a6d5b3b0e4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Static analysis revealed the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/mogefimeb.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091de5962d77---60004949297.pdfIn PDF document text
    • http://guchenes.com/d/files/jegovewozunuwati.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/65518676904.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/33e813aaef1073f76247303be982b06e/29018096666.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/54764190759.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd1b93570---55460160570.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/73065134915.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/986em1dhfvgvftn6doh7736e51/81774517108.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/489e60a2ffeef4d490dd08c78ffcb130/rixuremafik.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/fexilipepopezofi.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/66768c7f9515de787ec75b4fb97928de/duwijazerege.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/74782328898.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7983fe99---88152647243.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dab1a6bfc---xedav.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ubmn346pshcis973gs3cu7n431/dewuxuburalewo.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210705_184829.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/6adf3555b100cecae2eabd9ac2057305/25108754030.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bea0f0215f1e3d5b6f66605417ca8a43/68036801450.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cape+spencer+lighthousePDF 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_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 17532 bytes
SHA-256: b78256bcc0be4d6b1cf6b2dd32d2b6ec6a36d443f039c234400cf31140a01027
font_02_sfnt_off000145ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EF 10784 bytes
SHA-256: aef733818c85b75f615e8754243fe826a5e4123d1535f9f83f73727c3787266f

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