Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfeecf36ec5366e…

MALICIOUS

PDF

111.0 KB Created: 2021-07-01 16:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 076738b1f1b8f9beb6c653f94fb4f229 SHA-1: 56bf32e43dcd764a9cc5d71ab1dd4723ab784f67 SHA-256: 6dfeecf36ec5366e8ab4c009bc25de033c5ce2c2f03523636ac79885859233da
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to various domains, many of which are identified as part of a link farm hosted on compromised CMS uploads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to these external links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://charontrade.hu/data/file/77263832158.pdf In PDF document text
    • http://monkey-do.net/userfiles/file/39868919736.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/saxusexobo.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/zidedujofesosewepevazez.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/loxitasajuxuworexape.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/12171281833.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074a015200b6---gudewazivimatanekivom.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14c8df9b5---rujupeganowipopolanivopu.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/wotusawu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jiparipuvisifat.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4772ec182---dusalen.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/93693315715.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/35616505777.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/xeliforunit.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e6d42f38c911b88e2239ed4446033c86/31830887848.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/811jgvv6od5ijr4k1rd90jv6a2/45378146067.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/u2ni7f6k6cqbmvu2ak6sd5fas9/kubowu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ikdlebiefqsmi6ag1ucn146lbt/20061729040.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc2067750---58451517963.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/gavovavagotoviwefito.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/87853010142.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fdf92ef1---nutune.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/62092735006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+humoral+responsePDF 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_off00014f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F59 10392 bytes
SHA-256: 083ed8d82cbbc39e42dc8a1c9aae006e0a04982490851a33559425d5255b14a2
font_01_sfnt_off000166a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A7 18560 bytes
SHA-256: f550b5b4d2ce7a4f23940105e01792fb19a201b856976a9c4aa189b80310f53c
font_02_sfnt_off000196b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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