Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf924b614695441…

MALICIOUS

PDF

88.0 KB Created: 2021-08-31 06:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35078a13e8be0aecb71073ba639c8cc5 SHA-1: 4ae5da850a8cb01d63f34c2bb2e979c613154ea4 SHA-256: 5cf924b6146954418d86af2829883d1c298d5567777125e3da380ed0aa2f0818
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting domains. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=dayboard+chrome+extension', are likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=dayboard+chrome+extension PDF link annotation
    • http://uptownchantilly.com/uploads/files/vopogasenigute.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1b57a38155fb13250bec04a9c8918d88/97205238050.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/tugifakonobirijadala.pdfIn PDF document text
    • http://freeski.hu/freeski/file/dafifan.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/munek.pdfIn PDF document text
    • https://loctra.net/userfiles/file/favofel.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106282226458098.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b698e33dc---punezasewilu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08fd0c87d---18661951981.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/97407642407.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/73924823893.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/50db95a197b0e7d3b7c1b6260deeaafd/93626839023.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/60993574478.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/pibuxefomab.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mgkavm4atokeh1kpguemhdehj0/41678419801.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/wivupik.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/ginabufub.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160766892965b6---17966207296.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/95099419982.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c052cf0ac4e---38833004876.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/pukopirejudizabixev.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607882c89f581---13269274663.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/vibijovinuk.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/72858953696.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6cceaa73c---57174765909.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 18380 bytes
SHA-256: aaf92fae506c389d75c2ce7cc49f49214ebe6645a52c12467103db8fdbdc6142
font_01_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 10948 bytes
SHA-256: 1e0a04e978f7a62d87137703fb687b1de993143b5af1af15e6d8807afd433e44
font_02_sfnt_off000139c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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