Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7fcda9280ba2b5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 08:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85505d4f008816c0e0e326dbfd848d44 SHA-1: 5de2542eeb754572a06f6ad41a5b594c75cd946f SHA-256: 4b7fcda9280ba2b51a62094fb2dbfd877f6c1a0252bfa7c62a40dbee654c1eb1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and compromised CMS links indicates a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/356tdeigghth79tld1ejddpif5/vadadi.pdf In PDF document text
    • http://crediramasrl.it/public/file/jogasikupuwewoxodumava.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd6497a0a---zopokuwi.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/82092103058.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b467d717045d11c0f54a2b851ff96160/24070545706.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/31330011445.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/otbcbklf4k2bqr28bngvbuvj44/69932596043.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/72630649539.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/94140289551.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622331436.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bca52cfc8---43750007465.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/89809818420.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/12933630523.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/84335928656.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/mowovaf.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vsq6nvmnranl06vuqe4uhon7mj/xewizobofojawolubugokud.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/86576501203.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/776021d053a8c1b910901cdb87b3c1db/2012686255.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/zijodakinuj.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/du7hv9g304r13f14valgq9o596/24040834970.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/77775904512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fantasy+island+unratedPDF 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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 18224 bytes
SHA-256: 44ce8b88d051f2d99d07b8122acaee833afad84827d28b44a7cbb9326f5f0730
font_01_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 10312 bytes
SHA-256: 23d2e338a57feff81dec3292bc893362d4691bb51b136f2ad5b1c72775b40921