Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d23f16acefc10b…

MALICIOUS

PDF

81.4 KB Created: 2021-08-30 06:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bb24b638d431c8acb360e2a79015b90 SHA-1: 9ba65e0f694c2f7beb2c1fe0dbd14fa0fc3a987a SHA-256: 00d23f16acefc10b204b4845405a8d227e71a078a22018fe6f9b360249ceee11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://medvor.ru/uplcv?utm_term=hire+purchase+bank PDF link annotation
    • http://childconnect.com/swi/fckfiles//file/31528748026.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/zuxatetune.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/bogilegipotowono.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/90f56f2926e18bbcf53bb3deadd4fc13/pijivufekunogok.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/68018400832.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/24613489785.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/pawatowivilemagake.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f4449d772---libub.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f60fd46c28c3f0d883adeccfa286d880/womubebo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3b55f6b1e5bba752dad0a9a388a913c3/noxifijasa.pdfIn PDF document text
    • https://12shio1.com/contents//files/23307902507.pdfIn PDF document text
    • http://badgerhillfarm.uk/94902731167.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/99jc9vc1ket6fq6jgkfickdv11/45319999427.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2db440afd47c4dc0bf0167592e470f7d/tupawowemapaweg.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qs3eu0uj3s8ul94235rnp02ghk/2331291999.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/81137382339.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qurqudj9v2153p2m1kqv1t5mnc/kasagiv.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/91554126202.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/90519423243.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/94233505769.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/gujuliwebebapelup.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446e4cf211---58794256517.pdfIn PDF document text
    • http://didula.ru/img/file/35103562122.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/8389530068.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1kt473tv1iv9a21a7iri6krv34/91662426054.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4af21a0d---majuzovokimipubomov.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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 10528 bytes
SHA-256: 1fe3e0ce1c8c85d80a27c972d175810b6b2b51f58b4ec0460a68a105792e7701
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 17884 bytes
SHA-256: 4737fcc3d3b94f5f652e2dfd8bf81eb1de3cc0b61b57ebd1576f41a0ad0f3b3c

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