Malicious PDF — malware analysis report

Static analysis result for SHA-256 74604e480fba6a66…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 15:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89c498cd2df41a8bd030fb52b0df8e00 SHA-1: 7b25dcafbfd36534a2083627846362d9a2e87873 SHA-256: 74604e480fba6a664c417577cc8b06748fd4f7abb25c77967a8add71b05a0c8a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a redirection mechanism to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0f805cdd---9757422629.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/auhrvuq51ekep42v0rmt43pv64/15251275074.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6bdf8501a4ce3194f1d88d6dbc671b1c/kogujaponuxonogada.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/jodisurunididiz.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/45863816862.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/faef00d2e140c2d947293b0f1036bedf/78063049461.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5b5e1ec24e339c2e474f0313413f169b/54078563999.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/xukotawa.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/felusuzesunenuvinidux.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gunawonowudux.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/jevosepivuwode.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd19bf878---kemiku.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5b7650e8c8550a0f4c8bb74de328fff5/metipurojapujubu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/76086693522.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fetobosinutinetaxe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4rcr208l6ij6mm2hib27tuctkk/59270186348.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/3432433335.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jazupurerameterapar.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/dudanexumopojinunapex.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60249e1ece---rebowovetutitos.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/puwug.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/29526691884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=philippine+literature+contemporary+period+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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 10932 bytes
SHA-256: db1a5ac058b7c4bbc75e41e209d9bb0e57d6275be6f74c763ed031942888b646
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 17204 bytes
SHA-256: bd4944d0e4da84f0a6e54dd2d7aeeccf16cdae0f7f19a199135c0e499826b19a

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