Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ccdcfa58d5fd05…

MALICIOUS

PDF

80.9 KB Created: 2021-06-26 04:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ef6542b9d277bcf6e768d8c708518951 SHA-1: 712ce0801daecb96e8b50c98062fc318a7b1451e SHA-256: 18ccdcfa58d5fd05c9cbc5f608c78b98658ae1de6903acc1053d30f8d3abf3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting an attempt to distribute further malware or conduct phishing. The presence of external URIs and link farms on potentially compromised CMS uploads points towards a coordinated distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4177edb9831490d61d593a33cf71bbdd/60800119919.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l01cnj82ngqv3dr96pmmr7rv15/nuluzejusin.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/bugoden.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/fokavuxevolar.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4nnbmor1rvt2hb0jb6qipvqfps/losapojubivafisejumemej.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7d31643b087c04e39d27d2ff6b17a9b6/30765433745.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/jojovafoguvuseloni.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/nhjvjv482ubjjc2h2iob0frcjg/15375671203.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/xidimixekox.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aaa83cfe9---92531361573.pdfIn PDF document text
    • https://cooperspick.com/files/48454939339.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/50729518798.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aad14a0290a---6943581012.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/memalagusunivevamekepol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc4e695f3---lepirenikilexiluduwabo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872ba4e2f75---taxajuraripez.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de045de47288c6abe0949f6a0df00eed/wuzubuvepibabenoveletis.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wagumafuvagobuvotamoj.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c7be51a98fb38f31e05014a4d5aaa7d2/repisogufetowex.pdfIn PDF document text
    • https://fallsplat.se/file/54008090046.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/bobabowogor.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/9c8e60a6a2a78dadf1f2962b68d81ee5/66239080340.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/95819202929.pdfIn PDF document text
    • https://securitydm.com/slicice/file/levamizezekipev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=5ft+7+inches+in+metersPDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 10360 bytes
SHA-256: cc2683d8b982bb60563fb6398ba3d69fc8f4a949014767c31d8207c4145f8795
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16508 bytes
SHA-256: df6ffe06339da7131554836c6ed02c652dfdca5c50b4974e47ddc9927558ac5e
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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