Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb499d5f57a8f04…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 18:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac4372a6e715c96855b02122ac016a99 SHA-1: dbb8576b84c44fce60db5d751e319df81bd0f763 SHA-256: adb499d5f57a8f04917ce786f62884ed89dcbb07175040621cb9e8c7c346aa94
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to the exploitation of content management systems. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=mediastar+remote+control+apk PDF link annotation
    • http://cssh.es/img/file/51415961333.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/6641132182.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/neposepigatenimipox.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8be8a1cc---jufewonawowiluzenugilez.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gesujidun.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/251c0e1c78964fe75f03a7b3aa18939a/93114839825.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/ninuxobozazexifujinulogur.pdfIn PDF document text
    • https://bloomeng.com/uploads/22041956529.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lsmaf04f7gmu6t6gpj8pj3i008/57526986383.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/numon.pdfIn PDF document text
    • http://df-2.de/images/daten/file/25970976171.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130b460cfe7b---masakasefajodafonemomero.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/81405853692.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca87357718---74424993876.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/vesitemiledojovizatu.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/kasosabagub.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vifateramimexifugajo.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210916_DF3C1ADAC6B93515.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/revijibigosumetinanijefu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d60213d10c1149f8c639145f840df48e/difari.pdfIn PDF document text
    • http://vejwun.cz/images/59208215486.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/18212002530.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/80284880041.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/73396070179.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/84171430538.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10760 bytes
SHA-256: 90f703364b6c67adf3fd9df9b7e19cddd980619291f516dd4f57ff7365aab9ea
font_02_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 17008 bytes
SHA-256: 78ded06a1225840059aedcad399da69ba3d395a34a8544b807c9e2673ad29e03

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