Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcca7f02a38dd1c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-15 14:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f50350376b7c8712b49fa1a0b4f863d SHA-1: e5f45341174c1af4714efe485ec1a57c4a0b2b3e SHA-256: 9bcca7f02a38dd1cb2d337635af49c2fc4099f97c2549840ad54290af73adacc
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=bus+parking+3d+apk PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8d0b4f634837b6c24ac37a891d52bd55/55923439565.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fajodule.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613936fcd5015---golijiwidin.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/53211304650.pdfIn PDF document text
    • http://ymmicro.com/files/files/12960323928.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/votenawe.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/93915845838.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/natadigaboz.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1b7b8553---fofoxifukexe.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ahio546nampj117m16gtme1457/tebikosixubuli.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4f12eb91b4eced4cd0cb3d32ba511664/nirozapivotesiguminolepus.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/47491763909.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/hdbmq3kn0cc6ek7sqp7b6lgnu6/8267599249.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zemegedixipokagaraxune.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/80749329893.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/47659376090.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/67362264681.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f5138b7e---22290097805.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/vodetupupo.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/manidoxovaw.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/78608020591.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_off0000b460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 10588 bytes
SHA-256: cc19491461042c6b1c362ad7d2ba439a603657c0cff2c9f5778312d7e3c4c0e6
font_02_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 16548 bytes
SHA-256: 790499c076ffee495ac6b0d784b65676b58a3cec14d31a9d39c2b02b69019cc5

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