Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb394fa85bf97cb6…

MALICIOUS

PDF

92.1 KB Created: 2021-07-03 10:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63b584ff554c138e7710ad3950ccc0c4 SHA-1: ff4cb269ec076516297f687154d779818fd1a723 SHA-256: bb394fa85bf97cb69282b309651ee02cd0217997e3c97b2e980be05602669399
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cd38ec384de---52120606582.pdf In PDF document text
    • http://beergolfers.com./blog/images/file/bejagutafili.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/77930ede338b0801557c3ee6228b09b5/buridotoluzamo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee45867f3---94607699547.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/pumowagor.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/88390237621.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074912a582d1---kigewex.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160946faba2735---74687644404.pdfIn PDF document text
    • https://emmaushuis.org/pages/77878117435.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871904eaf85---78455131579.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/femezupaku.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/xodaxuvuwu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085267fcfef2---434787652.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/zuramoxagilusavimiku.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/38sscvni5ad0fp57furj3r8sh8/luneviku.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/09e5be87e5dcdf38f28b1f81fef05a4e/fapelofisiwamuguseweligar.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb082ee2e---94203720496.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160915b729f970---47725087812.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/33530025572.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/70b2ed285b0f4487f385a41d4a5dd399/bubukewidanarujujak.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/mavemorudozobepobe.pdfIn PDF document text
    • https://designclarf.it/file/87256550474.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7qpc7929afb78mperuurchge45/vafelu.pdfIn PDF document text
    • http://www.biologycorner.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+calculate+the+total+magnification+of+an+image+under+a+light+microscopePDF 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_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 18048 bytes
SHA-256: 329dc8cbb12b5aad7e1e8d14813aca20acff89ecde2dfe26d60ef78d86956472
font_01_sfnt_off00012f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 11360 bytes
SHA-256: 4883606e3bad07ac2efb05cc75b338d4b80ba274b8cafbe2e2ed0fad1b58e3f4
font_02_sfnt_off000149fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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