Malicious PDF — malware analysis report

Static analysis result for SHA-256 952401682ab6350f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 03:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4ad1d4e2df52e0ef96555345e9ef5df SHA-1: 8b037f964c48bb5466f0dacecb493976d0e00f1d SHA-256: 952401682ab6350f537207c38b37667bd455cd925bfbf8b528056e176e7e05b7
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple compromised CMS upload links further supports a malicious intent. No scripts were extracted, but the document's structure and embedded URLs suggest it's used to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://editions-tlp.fr/ckfinder/userfiles/files/guxata.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1a5a409c756f3b33cd67f5b70b461d9e/jobali.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210624095027_342939931.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0db4e30b---sapokizuxojojepituxe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/869b2e4dab96f01b981c5ae601c5803a/2170687332.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/rukanegozupeposiji.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2e608a1629e1ec5cb7654d9cec7ad25b/jemivalewubekabiruzuruk.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/28f803a06d9a91c7bb6df6c1e54b9000/75752477424.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8495b061---moneneforokiresatezulofa.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/27126364619.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o4740bosrbcg6mus0qgv6g8g26/divesefusevod.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/53397900839.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089ac79bfa42---visofew.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xarivoxoxuvugadugoledi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a187afe26---fokutivotasaximofisuxiso.pdfIn PDF document text
    • http://darstin.com/userfiles/files/lipifele.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/wuxefikalajetafutitebudar.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mpggbmuabg3bhm346pqm1ge63n/gagozibolama.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4b985b97---61457789143.pdfIn PDF document text
    • https://starbox.fr/img/files/73166047938.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/pegofopawisibamigom.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f51e69c4ed30b661ba88a7364f97d6c1/vireteparelovumakomen.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/zezafosizavobaguroz.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/75992915071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nuts+and+kidney+stonesPDF 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_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 17684 bytes
SHA-256: 1dfa4ae0f4a4895fea3750195578868112febef6ac5a1f23b4746aac2eb315ef
font_01_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 10380 bytes
SHA-256: 2272b358796f8f8231a05d8176bb4cabab9062a29151a4bb4897528431f81a50
font_02_sfnt_off00013a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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