Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf733137ca0ff222…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 03:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c02b27ef7ac0667d9e7fd88fbeeb7bd7 SHA-1: 59ecd2e08f72360d35a4343a08f3490bdb78958a SHA-256: bf733137ca0ff2222089084b887912d7f6e2fc64f2537fea6b6b76a0804f0dea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://washchienluoc.com/upload/file/wutatidifero.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/resadixeliwinodajenexovos.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977313006da---mowezerak.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/perenegabigexamerixim.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b6e1f9914e1632045aad4bbed080b770/gixozawudinebupepulumajo.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20215272145176327.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f851ed65---zumanim.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1ee5dfc9d042acc041079aca3096ef27/gifakifibilerimebakologa.pdfIn PDF document text
    • http://sireny.net/share/files/25562058076.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/27726762587.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e564b2139aeb099ce9db404c42973920/15705050023.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/54694367917.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607774fa96dcf---dubatujipumelekozorabavu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d9ea9d155---88488509843.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec858f365---34971851022.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8dbba1316fe39c3c50ba51d705c342ee/25411199703.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d090c998---83220149289.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/malavoror.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607438f2f4165---mikoduzugixegelusigofamis.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20e749542---kefazowilexok.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f1c7d3a4---30311880276.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160952791659b5---9516090484.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d637b007fd---81295551721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=short+hair+party+hairstylePDF 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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 10436 bytes
SHA-256: 8e6c7fa354e0d26ad9c844c8d9d29cdb7a7fc920bb3c9e5b12d6ef4651dac5f8
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 16836 bytes
SHA-256: aa388e4a1085285854c13b23240a447293331500a78bb8a96303929d4c8287ab

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