Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e631d7aae6e743…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 08:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 730ee7053abe7f857e0cf4170dbb7046 SHA-1: 6218deea4d6ca5ffc0c5b9e407d01407f54d3987 SHA-256: 45e631d7aae6e743708cdecd1981a9de6184e00ec8d047e321248b1d1a2e8edb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of a fake invoice lure heuristic further supports a phishing or scamming intent. While no scripts were directly extracted, the nature of the links and the ML classifier's high confidence indicate a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jdv2c12r1t0fh6c38ubin5avn2/22912392840.pdf In PDF document text
    • http://chaukitchen.com/uploads/files/13930477626.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/ligapidaketejipitelenu.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/38110620428.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/66842302510.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/26949380830.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/lipeponifeminunelow.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/23425411410.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/85vc6n2c5q4hfgqhaol9hu4qa3/pokukitologarakewusu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929e792cb19---81869761068.pdfIn PDF document text
    • http://ekotronic.eu/files/file/tubivomegivexe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832f28223ed---478342496.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d38114ea269---fetajajurerezemazimij.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/96c021786541ad274cff4fabafcdf78b/tesatusigopiv.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8534c0aa---38787891380.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6b703ec64---pufoxekuwijojowobif.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b933fa5743b---57001200584.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0308daec77---fipafo.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/22344512222.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/80189381981.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/875d4890e87f382a8e374b3cc9bd4344/satefidukojipuxan.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kemelazuwapudarafu.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/fufemijewimo.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/xitozozaporij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=social+studies+grade+5+worksheets+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_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 17240 bytes
SHA-256: 0f539c0628f43300d34b50e6f559e14e800e1a49549446f39afba6fd415d5568
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 11280 bytes
SHA-256: 608b09482c737f1a792d5fcefef9fadcb83130bb4cd02f9c969f5131c608b96f

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