Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6ee442b34dc91f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 21:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3fbdaf3ef05746b90d14c0eca053f743 SHA-1: b34587769c4b97252789c4fa43f6f72dce57600c SHA-256: 3e6ee442b34dc91f98a001e9c5fd20f0701c0b57dd90f5b8d00ad3687dd17f60
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://mizuho-co.net/file/ck/files/minagowisofapujidaxasedeg.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608850203ac28---82579944547.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5ffacaa2---51441582334.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/xukumuvasejeloverizagi.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/58573120259.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fsspfqu4td3hb08jokr3ml9tv1/rimezinuzamemitejowemopab.pdfIn PDF document text
    • http://elitvorota.ru/f/file/puwimivijoxunekimiw.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/1440124349.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/gunopidira.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/duvirumuxugumawedizutev.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c85448f0a6744ae25c33ce8d70c21b49/bawojadamumixivasoxalosab.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607796da0974e---pivexebexunofizozewomagim.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e8af9d137602a0796db8388b0dd3142c/xorotenepokijezopumuto.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/guzula.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/salaguxofomag.pdfIn PDF document text
    • http://proia.bg/userfiles/file/xozofudefupuximomokexex.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3e0cq65d4eals5fkig4kda7fso/pimakavakulepevopo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5e4956f8---26996854236.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/32070973355.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bbf74295---puloginizidaxafudugit.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/dupew.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/48816055927.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/45392977763.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/348fadda19bf4878c06c51fe76bebb17/wumabibivesojeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=up+police+re+exam+question+paper+2018+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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 16624 bytes
SHA-256: 65d1a3cc81948789b1f5c373615824837f1f22382231109bf371b5ab15dc5746
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 11640 bytes
SHA-256: b2b93881603255dc5e76a410cae4703ed549c0841cca7e6fd1be750bb8d26f38

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