Malicious PDF — malware analysis report

Static analysis result for SHA-256 9447b089d1820d90…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 10:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2219f7ad68548db0c8f3bed7167b13b2 SHA-1: c3bd3b029696fd86e0497b879b1d9ff9c2340cfe SHA-256: 9447b089d1820d903135f41a42a9d207c3c59c597fa3fc1bdee380aaaf14abb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=rpsc+1st+grade+exam+paper+pdf PDF link annotation
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/dd096682bc5e0dea9efc0ab68c8e6bbe/10592076288.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086507ee1ed8---80885410089.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202108271949359304.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/wisalor.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/26828115788.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34bb35e75---75027316789.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/77668331450.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1365fc1c---71333016026.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607079399ec0f---fokozonetilizeris.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kotisijowipibedezujux.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607160a55895b---67942337678.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/20851225267.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/16267433970.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/90365380688.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6r277ckapl820hkkd09dkrkqfa/55408437266.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lu10iraj13arpljj1h6gn8pf0j/66949433569.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1565330b783d866816b41e5ff8b22963/99187867132.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052418093923.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88d3882e5---53302765604.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/rezimaxelo.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/mevixexibesapigefizan.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16085e1123504f---67074393460.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/13561448795.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a7504cad---59301660587.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 20992 bytes
SHA-256: b2c9aedf1fa2053a6b65c953eb439a326e3137e6b9c938b92e7bc56e26004439
font_02_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10800 bytes
SHA-256: f6095add2a887ed4ae4ce9cb027808e1e1f834b8bd11292c4169a2b0fe5e805a
font_03_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 16276 bytes
SHA-256: 5bb716d59abdcaa90882c26b962adfa54c5f941701f66a094e29873d01af35be

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