Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d491f05d06b858…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 02:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 217c1e9577f6538b7baf9e12da5ce008 SHA-1: 1a8d9daae41e992e918fea0de6cfcae38e87d6f3 SHA-256: a6d491f05d06b85862c9cf86f674e53e4f5536d4206fd668842f44bc84e467a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution mechanism. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c4f0eb7781af61e5d656b622cdcaf491/sexum.pdf In PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/77693495003.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6d50cffb618932ba25006b9372393afc/juvepamisepotimafok.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/kerusavefupuritukepugobet.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/34091242664.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wifisijibatuvedugusamawim.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//58659098669.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/nijaxifipedovuturav.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lu10iraj13arpljj1h6gn8pf0j/66949433569.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6b6af215---89115126265.pdfIn PDF document text
    • http://charontrade.hu/data/file/68259952067.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/luzalugu.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/25497835443.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/44862325088.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8797f29c3f0c78f0cd8ffdc0f5aa057/mevot.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/00a522b37bad32c83d6f3adfe9a0702b/92033976305.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/dusenefomar.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bca76046bb3---zigus.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/budafuzobavalaganakakuzo.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/78566188640.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/39378046888.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/65df99f37250373bf7febe4d6f14a08c/silipawolibegovizodonuxiw.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/66354626440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fog%C3%A3o+brastemp+ative+timer+inox+4+bocas+manualPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/23947006236.pdfIn PDF document text
    • 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 11448 bytes
SHA-256: 6db408fcf52c8c32db54c78bb66153045aa9aa1aafd66362c7b7a21300199536
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 17276 bytes
SHA-256: adf2605991cda6f0b9d7c0ad75f49ecb387ff221e7189079173301a58d3212b3