Malicious PDF — malware analysis report

Static analysis result for SHA-256 131db956f191dcc7…

MALICIOUS

PDF

91.7 KB Created: 2021-07-05 09:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9fc98d9453950a464f774fca57086397 SHA-1: fad37a767c71195942d7e212b3b66c257b336f1e SHA-256: 131db956f191dcc79eba83bc596a507cb392b2bdbdfa1435fcf44070238921a4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms. While no scripts were extracted, the structure and URL patterns suggest an attempt to manipulate search engine rankings or redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://pestresolution.pt/site/upload/file/78167047526.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/rilubedufijoriwesupokog.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5r16kv4fh92bilnpc8hgk6kgv5/tusefemiraxulidago.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc86a9c1b---45984300773.pdfIn PDF document text
    • http://meskerjager.nl/media/files/mamago.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/robakemelekodejokafikako.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/kiniramevujurumemotidere.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0dp1eglihj3a9hoek32gl41l3r/nisogubusotima.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/04876fb0e0fb5a6a2650f8d151a3016f/tekixuteluvuxolidejaxu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/jhpjovitlq0f42on35ppsditha/57299135785.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/42a6ee961bc2ddd958f23c0395260bd0/rosidelel.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623214812.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2981ccac---pesiwuminapomokonariji.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/zazixilutanomoz.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75e5f049f---96691342779.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2592b917---584466121.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e72a6fa9---72950737698.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/josifojuluradexore.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5bb8babb0aad45a75872a3826e21c2a4/lekebalalojuzowe.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xikukono.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de16104750e---71613484340.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/faxixumerufukenarirenos.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/dpcm2lau1kc9qmk72111262c57/28496501472.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/wevugukunubasixifusipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=undertale+play+pianoPDF 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_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 18196 bytes
SHA-256: 3725bba17f8546c1957b0eff5a0e16a1d5e9aef76d40be584beace2fe00c73b0
font_01_sfnt_off0001322b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 10340 bytes
SHA-256: 0364c12d453873fe76ed4910aa8b407cdbaf3c7e005975bd0046ecf339605b03
font_02_sfnt_off0001498d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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