Malicious PDF — malware analysis report

Static analysis result for SHA-256 971baae1b7d7e075…

MALICIOUS

PDF

92.4 KB Created: 2021-07-25 13:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07cd00985d793082b8faffba3fe4ff1b SHA-1: 0f12ad02e0fcb9ec478efaf57f380571180da8f5 SHA-256: 971baae1b7d7e075b6aaad6e6c6946b38da5883669ee2d9a4b1f1f00c6f44412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites, suggesting a phishing or redirection scheme. The presence of numerous external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketoanaca.com/uploads/image/files/86911136603.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rbgp7c4krpaifo7kpaj33e502v/guwosaso.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/20ac02b666d6c2fa9034b8119ff1f4d6/sudewoxetekimulaj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebdad563d8---96117605887.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/oephdhceg971b195jkamja03lu/sasabeletalitawirodekevuv.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/03f5e710be23090eb393fc8c37d794d8/81633557155.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a944e954ddb---72894304439.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d84dd1b0f06---kitikegoz.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gtq9nh03r9i4b0oecqugd617im/5920894417.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/pgvvun7phrveivei2p8h0h8ckk/95648532236.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/972da7300973841256db0e5a3dce97ff/taxasomixixisiketixo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f9a74191---76327691338.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/34510908634.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/pevozakejubuwepe.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/59962309373.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/n422kcheape2a1apic0nvr5216/3673283068.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j6bc2p4adaaafmsoupd67vr133/fagimabusigekipoturom.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o5uggdvicgck4qjsdrobi8hl7e/vavoloxilona.pdfIn PDF document text
    • http://dges.in/userfiles/file/pesogekazomexejabewirimo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef741873da---20945169438.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b0516c0a---lifugitivixud.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c796a59d---49694652915.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/keweromezolak.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/ramijizovuvetol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=libros+de+logistica+portuaria+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_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 10888 bytes
SHA-256: 9ebe5a17220e044d3147a93e5e0d0505562a0f6c56d209754d370a9da9de1300
font_01_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 17892 bytes
SHA-256: bec34c75ecd86834f8f36e35921287d6b2b446e1d7ddeeff7a495c9648afa0b7
font_02_sfnt_off00014988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1