Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d5973131de2cfd…

MALICIOUS

PDF

87.8 KB Created: 2021-07-25 15:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4951bd60e58850e96d3feb98d24b53ff SHA-1: f8b8f99cc1e9330f9acad6b3f4b2e6593dda8cdd SHA-256: 79d5973131de2cfd9506a981af7e486dca3df810a09e9c2354b08b260ed52b97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leaguengn.com/userfiles/file///raturopatozem.pdf In PDF document text
    • http://alliusie.com/userfiles/file/rawopi.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/61167465571.pdfIn PDF document text
    • http://mesterek.net/tmp/futideropewuzulinok.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/gitexixum.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/bozujebezusiwes.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/duzananibikesobap.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078863640f37---87293687876.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b6551ec31f9d3e90f17620e48c4741af/87158915403.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/7424735904.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608374c3c10e0---fufejipofenifub.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/lixemiporigofi.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/82577438490.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4a515bf28---fubogarer.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/gutibiletoxosiwasivedibu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e96c84a53---wuxuwerotapow.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/74584612522.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ca567970---34590330.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eca3e16ed---vubefivejozifi.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/lepusomukarigoza.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/farep.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/82872368698.pdfIn PDF document text
    • http://hodori247.com/uploads/files/lowizonelerot.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/6705577463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sign+and+symptoms+of+newcastle+diseasePDF 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_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 16916 bytes
SHA-256: 7180628bb6d4ddbe4a9dbfc5a008b67439124d82237d7ee4c479c20fea32187d
font_01_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 11136 bytes
SHA-256: 8534d32deb7c13e714679bc9a65b89f28ac255e3422f80158adc6391f56ec2d7

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