Malicious PDF — malware analysis report

Static analysis result for SHA-256 f028ec5a3ac98f2e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 05:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2666cf3814b48040ee7b4ed203eb2f85 SHA-1: 7575bc9b609ef2d18bd45e6b7deab9edb7ef7810 SHA-256: f028ec5a3ac98f2e11151a2e102f28fa8fef78f111d1be1bb7c70afb3f872a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://infrive.ru/uplcv?utm_term=cambium+networks+force+180+pdf PDF link annotation
    • http://polipack.ru/content/file/9264317436.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/71850889778.pdfIn PDF document text
    • http://cloverdiamond.com/file/wasobesikuxatapunes.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7171b1cf4bbfdba40bdf07a296a21386/zupatinozisepinoba.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/49882363445.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c9ffd772a5d5a18565284a2b395e8262/mugulube.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4aec6bf7a1f43d18c9bc718aef5c77c/sokegifosilugurukekizuv.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/ranexixusut.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fd53c1655---tikabuxokalefakegemavaru.pdfIn PDF document text
    • http://budka39.ru/files/lolubamutarakeparujafigif.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/75453861083.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/69114326912.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/xelokusifapugelosup.pdfIn PDF document text
    • https://pratham.one/file/91600039479.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8996243e2---75413326986.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/77938216432.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887c0f823ad---56999481495.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/lolujogaguv.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/walisutebezulodidim.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/57488841515.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/rusirovazow.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/7328209652.pdfIn PDF document text
    • https://dm288.rs/slicice/file/98618618578.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/viregukagetawotavi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fb46efcd75fa09cf1b97cf756a44af69/pesipaz.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160784515de11f---69316774039.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b14ce608aa46fc913d0701fe53ce7e29/36665116469.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_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 17576 bytes
SHA-256: 56525b24c7cc335e65ca82fdc446945c7edcb2388a8d6fed3c0da5f8d3adf37d
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 11564 bytes
SHA-256: 8b86111fc3cf04259f35f61110cff6a0918823531bfa30613d44cbd419f08ef0

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