Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec66f2d97034330…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 06:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfa68c7e70ff772444b60df60f5942b9 SHA-1: 68aec90335dc9319ae47cb222dd48be947be9fb9 SHA-256: 8ec66f2d97034330f9dc6c0bef7bfe5f285c5756a8cb2e0e47df55548f5ac656
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing towards a campaign distributing malicious content through these compromised sites.

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://egyseg.eu/ckfinder/userfiles/files/zuzugebamaw.pdf In PDF document text
    • http://fujiya-la.com/uploads/files/88787272231.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/40003776069.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905221223_6x6sym.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613613718ae11---lideri.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/nokejiputaze.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/54021954528.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/80727719433.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210908165356_g849fw.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/porefekefepe.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/70589451345.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dck8kk2vg6hm970oi01msddln3/zinodofipasumasu.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/82790449127.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/37164173903.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613120c035ab7---34440653459.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/42934362564.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74011862129.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/58127656078.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/xonedokeluvibiboki.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///71589445165.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///99915882502.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/gulugevu.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902005807.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/80435075307.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/tikonosozowoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=chal+mera+putt+2+movie+download+freePDF 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 11000 bytes
SHA-256: 9b7f22ba92b8e1aac496987960d63b71ed1c3b20d60b434053844d3d658c7cec
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 19452 bytes
SHA-256: f2c8a2124f92c7659e3675e036b974f387e91e26646dc1a8e799d296bad03a4d
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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