Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24544b3c933d49d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 14:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ef083f2cb352a56b7ea70417f9155fa SHA-1: 342b4c0ac44916d4939d0702622e854807447a68 SHA-256: c24544b3c933d49d80e5f5f8bfea72ade7ecc472e881f0ddce42e890e4bf28c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aartipalette.com/userfiles/file/98699266822.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4a6e1477---nixajobitojujuzupuwululop.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/55284542706.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xamawadasujepux.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aec33827af15c59f9fe3b768088e43cc/89238441135.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sabolobupiwonumuwetawi.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/worap.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/39146555574.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a90982ef---10199494696.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/neloge.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/62135230265.pdfIn PDF document text
    • https://go2germany.ru/files/file/lutuvekumebonujulajix.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/ruveworagufesewovijadezip.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/jameduvire.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/78281278005.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1a3d40e9---voruwulatareno.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942491c82f6---89281224288.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2707ddb519---27748395910.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/siwiwu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/bupisaxulifurupujesijav.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/35495223254.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/solimotejidorow.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/bizododu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=amu+ma+english+syllabus+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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 10964 bytes
SHA-256: 9f91259a35c1afa1c9f9ee85c0aabb5d3013dc33abd4bcb24f00e854583bf057
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 18216 bytes
SHA-256: 54072f53066d43e4d7d912907f9ad858a59f14963bcb30e218992359a5d8efdd

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