Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be8c13e3da89a8d…

MALICIOUS

PDF

92.5 KB Created: 2021-08-07 21:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1030cd264c0f12877013b2c094f0516 SHA-1: 73fdc6a8e5b043b694d56ea2d974007f5ef396cb SHA-256: 0be8c13e3da89a8d09391ffd47264014a829ed5777582f4c50357a90c41266f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, embedding a large number of URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. The document body is unreadable, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=traumatologia+forense+eduardo+vargas+alvarado+pdf PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4220b33a2---pixutokazokurepi.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zigubapotutasifilovu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/09c0469cda19cb31f460dfdd5e520a86/birezesow.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/52c4d4d61f1c0eec72c83e33d50f025b/kolalibumonenepuwagiza.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/90527906899.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/57485429413.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/rijiwovupufikurulabeni.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8e76c667bd13c84f1f1cea0b43470948/25444758295.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40cc014c65---71125978360.pdfIn PDF document text
    • http://gtshotel.it/images/file/pukasir.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/nitavoganibep.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b928e750---61183154372.pdfPDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ab92f05a90bf7e35c5dbe9d34be6ef46/jibusewubitikitelijoga.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/muzudebisimirenol.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/95ins1i3qanael09f9skn3mok3/gudasibavaga.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda769116af---jufemodofafek.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33fe7bcbf2---kutukagupirimaritan.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd11fdb5fcd---17070804862.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2125e50d34---98961317001.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/kuxobefeguginigelokiv.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/8587671440.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/jonajakugatiwazupik.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/rajafilimeladamuwarasi.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_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 10968 bytes
SHA-256: 2e1a9181c2a0c89521f84a6be699203e8708aad9cfb963b01c1ea85fd51836c0
font_01_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 19476 bytes
SHA-256: 855ae8a3bd690b518e9af40a0045c643538c038b2508cebef27a8b60ff6d04f2
font_02_sfnt_off0001494f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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