Malicious PDF — malware analysis report

Static analysis result for SHA-256 5281270e4d7b3460…

MALICIOUS

PDF

132.8 KB Created: 2021-06-18 17:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a774532f864fde0deb2e429c982e560c SHA-1: cd909284454437f8069252703575648166ad7cb3 SHA-256: 5281270e4d7b34602e0b7a95b21c753aff170a213a1f0f8ecbdceb89f941ade6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to unknown PDFs hosted on compromised WordPress sites. This structure is indicative of a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38d6bd04c---45543779191.pdf In PDF document text
    • https://banghenails.com/upload/file/89737807681.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b160f8dc4c0---kinunuvopivibofel.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/lisurupasogejepibe.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/lcbsnfngu0q4avig24pdss6p81/52528371078.pdfIn PDF document text
    • http://iphysiology.ru/upload/sijomabiwojoligaduvidas.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b3cd7cb9c4b9530d330b5ca56af46f7/69413660183.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091367cd6803---jenamidisavubevapupibop.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd3d56125---rafunetuwus.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/611827ee93596038d3d99032debdc6e0/kikigudapali.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/50840fb8a2aef55adc2150146ed4eca9/jaxanupem.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/39113189820.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vomufosa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826a38a502d---14058793023.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f0094437---soradolazivumimikiwe.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e10640a94a7a48fbd9c7ccf2206aea49/pekuxurapuruvalujuxul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ark+mantis+saddle+idPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D09D 5024 bytes
SHA-256: 1bdd124e0a8ab0d9c25a5746637ca80c11aba10a810d4627866f3c3392e4d0b2
font_01_sfnt_off0001e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E196 10728 bytes
SHA-256: 20380a16842595296f4e6893408e25d53306555f766787b885be5270483bca89