Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5577d97a46df1d…

MALICIOUS

PDF

82.9 KB Created: 2021-06-28 17:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c57d918fa1921a8b1248d946fafd39a SHA-1: fa365bb67de96656eb58f08a6d40dab8cfb5d49f SHA-256: de5577d97a46df1d465c725d1758dc4899ed5e184137755d8086df6b56274375
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially malicious files hosted on compromised websites, indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The presence of a 'download' button heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa799e734---munulirosazodasupop.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8f417ddff4e90e19f88920d44d73d07b/xufixon.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sasaneb.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kafozixunipomu.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/59858569005.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/zusimatem.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/423372b99cb79eddf29c9983bbc49ae6/ziboraro.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t30kahpvetmdh96sl58omc0qcn/24019078533.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4ce7e4a891b19d88a7f14d63121e74e/87178428546.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08178144b6---81248558910.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a4e64dac856b83019944ed2118a53c39/tapazevuzaref.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/20937382345.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/snunpu92ru2gurn55ci67skb66/xamiterubogirivunutano.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/lugisitenamosuwidunaxuxo.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/85146168028.pdfIn PDF document text
    • http://armanetti.com/images/37339699861.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfef8ecdbe---15846493964.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160744bcb01379---17943874061.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/36548992393.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/kogetimawo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987b219377d---gisegipupusigeg.pdfIn PDF document text
    • https://ahha.az/userfiles/file/pupapumageluratogilijizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=xender+download+apk+freePDF 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_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 17060 bytes
SHA-256: 4103047c49d199d480acce24d524d019e394ba7b4cdcf3c5cb29dd81659b6b0b
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 10320 bytes
SHA-256: 31d85aa2cf21354b91f28962cb3a17fcaac4a0ae8a270622203acbefc410d4e1

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