Malicious PDF — malware analysis report

Static analysis result for SHA-256 637031dd8a1d3a61…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 18:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 644e38dbab0e96f1acc493d200c49ec1 SHA-1: e608f70970f8bccfb7ab25a4e22820a335b9eb28 SHA-256: 637031dd8a1d3a61904a1b0b7042da4eb9d181826267f5cdaf46c0b69ff7d23c
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and exhibits characteristics of a credential phishing lure, specifically targeting multi-factor authentication or one-time codes. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute phishing pages or host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the MFA lure heuristic strongly indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://zenmobile.in/jaipriyart/uploads/files/jogixobamikuvokukowafew.pdf In PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/55450919753.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/tetadekepavajomamofabuv.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5aa7bc91---43097411479.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/s37120en16m63fato8rhiu1fov/dumejevematub.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103df0e160c---genufewilefamidalupopo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/desag.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/forume.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4843307179.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086852b47d47---tereb.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/puxugepibofigikawod.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/56e05c933b87f24eecf5e1b5f16060e7/72228207264.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9824abfd529e2f49bd1155937de54085/11859375615.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/28484199463.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/87269759237.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df477adc47f---22914425938.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bv2c36ccatl8a6e58ojovj5sg0/jupulejukepuxivebe.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0ksc2tpl4g5fq86mcs2s3m2fj6/sakojutamunu.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/79762391271.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/25225789534.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/3eb51e9662d799393c38dffc28f0f95f/dufakerulezebovajek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=9+regions+of+the+abdomen+pdfPDF 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_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16860 bytes
SHA-256: 9f7082e68ab770ed35dafd121a14dd4991801aac3f5cc9ea7f98286b752c5b74
font_01_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 11112 bytes
SHA-256: 47282bc6255519daca9c486839f270e99f38a1dba295e8860b468618444e9116
font_02_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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