Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da3573048849bfc…

MALICIOUS

PDF

89.7 KB Created: 2021-06-30 09:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37a4b58b421b73639ce550cf922a6a2d SHA-1: 1a4e2140051c826bbf4b3c015d2eb470f9e4ded9 SHA-256: 6da3573048849bfcea8ab47d3fe7e8470bbdcfaf316033cc3281f2fb37745a17
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 ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=muscle+tremors+in+arms PDF link annotation
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3c5577a8---givezimobofavagivegarulij.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/zeladipajaposawikaxe.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f1b3b4d095e4650d759bd248309e2515/75749649477.pdfIn PDF document text
    • http://vbs.pl/dat//file/legapelipujozezatifesef.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rexidijavufodixatitifev.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2badedf53bede00fbb1f6edbc4838cc/robadezalopigegugavowawas.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/zenemuxazozumutiwuxiloji.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e515fc318a2c3e8e117069a0a9fdac67/80299835135.pdfIn PDF document text
    • http://kme-kme.cz/files/file/11102733110.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba2cc1a9eb---milojejiviwisizudobuxizam.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa248e8e61---vanulefenoja.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/25300501601.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/pasokoze.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e96f8a898d8e54ff13a1cf90c4e9db75/67763667719.pdfIn PDF document text
    • http://adveotec.com/img/file/wagavatolerorales.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/54905d8c3d695dc9e62f0e622586b5e3/gerovidegaramosutomewe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e3ab9470---95819452595.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gobetodudukolegiviwar.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a282267b9---wegonuwanuk.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/525b227b2f98ca73c6ed853a15508111/33098366231.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b312027f5481005b3250d812623cf084/wazudoxojefigemonaxaka.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c684137739---gubemepetufo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608441f13c6ee---mesedawafelerotalonoxiv.pdfIn PDF document text
    • 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_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10484 bytes
SHA-256: 13256410b51ff92428bcf83e3645b377d4457ed4e1753255df234b4fbba24d6f
font_01_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 18040 bytes
SHA-256: aab79894b6b954412ca0e88bb5ea3aa2338cd7fc87df3599882caad8fa36c20f
font_02_sfnt_off000141e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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