Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba51903bec1dc6d…

MALICIOUS

PDF

116.0 KB Created: 2021-09-04 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39ec6b18fdac17029e9ac89f57e358f3 SHA-1: b72bea2745242b35a059b202eddbc04a5531d9b5 SHA-256: fba51903bec1dc6d4e06e182b7baa25081f2544d7f14c87b1f77617b985cfe20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://melinterior.ru/userfiles/files/duxav.pdf In PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c5n4iug7rjcq5c6764ih66ffre/16783146995.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc496d9b3f---pobufujafarej.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a30274ea5---25355799481.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/ruvubegopizet.pdfIn PDF document text
    • https://terracell.info/images/file/37834440247.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/8040875243.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/12790873827.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/fubegifinisazebosibad.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/rezufumijejakuwevu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/68f999d71d399a0a2229d5f26b0f2b69/49370328027.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210831084501.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3bdf6db2ac454a5a3bddfa1861d5235b/visifis.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/natitexag.pdfIn PDF document text
    • https://isleo.com/i_photos/file/tuzufifuted.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/67153279850.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jibujivevuzuxasujuberavi.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jonufonipulipubuwuzunis.pdfIn PDF document text
    • http://geasit.it/userfiles/files/58216860743.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/o9a59k35ni39bb7rnkssut2eq5/nikipuju.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/72098026754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mathematical+foundation+of+computer+science+pdf+for+bcsPDF 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_off000160f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F8 18296 bytes
SHA-256: 2e7997b7a054c44f2bc940797210dbbe5b33c225c2d2dabc9b4ba462e75e1396
font_01_sfnt_off0001902a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1902A 11120 bytes
SHA-256: 700eb837d8a2fabc7f8f99fa2ed7823c19bbb36154bba2c8d9c545430106ada6
font_02_sfnt_off0001a9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1