Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72c53f359bfc07b…

MALICIOUS

PDF

95.2 KB Created: 2021-07-09 01:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28a134742510c2e54e5d45fdd64812d3 SHA-1: 5e98a71fc206ff581eedd67d89090139bd912ff3 SHA-256: d72c53f359bfc07b0f729748eb954d4209810007f88aaea966702f91ca0c5813
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 5

  • 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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/001dd0d6db561827213c68936c0a9bf2/turunanedetemogaf.pdf In PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/xiboderawifegaligeniwamim.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5db4f96cc79416d253ca8dd380bfef19/rejadasixawojujubo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/53373552606.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/19373527076.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/537c626fc8c472be18efa2cce9f3cd5e/87303518400.pdfIn PDF document text
    • http://www.siposferenc.hu/html/52635939577.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5f4eec88---jodib.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f2122ab657937bc9f0b27ac6fcf591cb/43726217947.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce64d6cd4a---15213135794.pdfIn PDF document text
    • https://bdata.vn/upload/files/xesifufo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/662e676df530be3b444d30d080cd5e5f/4708176388.pdfIn PDF document text
    • http://charivne.info/images/file/napisagegefetibasozod.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/gofavosugogetubizasifoxi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/836f785b371b86ce42ecc5f5ee036f8d/27210710189.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/62760687046.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160817d7829902---gugobe.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/72hov1dbhp4okigdfo3ceiqtnq/53045706420.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ovphn1cr4kchvk3nobrrr94381/57863549517.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607966b0ca97c---wudezuxinuta.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f63ece4---56991712314.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/kimobojetuxiregokene.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf075a8dc7---tipexumibifage.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/tteso3grp55kaffl3m0c531u55/dupuzojazegos.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/ludilowujomomimaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=meaning+of+energetic+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014fa9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14FA9 18952 bytes
SHA-256: 10502a4fc0232d8e2f5205f44e538597543526c86edabaf973acd49ae47f9229
font_00_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 23500 bytes
SHA-256: 671f1fe69216367edd307a03070c720970255f3f951f714e7526037ccc51d520
font_01_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 10608 bytes
SHA-256: 452251eec674006c83f62626c22dca0939eb3bd78890ac0d8d49aac04f5d3564