Malicious PDF — malware analysis report

Static analysis result for SHA-256 162983dca8ff76ec…

MALICIOUS

PDF

104.2 KB Created: 2021-06-27 02:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ff51ac821f1a2dff8eb66229948f0dfd SHA-1: f8667ca29af4bbbaaf7065479e6b5a93b8a2d5fd SHA-256: 162983dca8ff76ec6191ee031d3aaacded0a08642a947d8767347a3649a30050
96 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to direct users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d881440672---61804214202.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/20e7ad395f7c8e3dce67b6c6b052cfc6/93578011677.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/27548838e9d27f080ede9a7ce5b3bda7/82272392514.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/raleremazogivoriz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/84djpbb3sktak9apndsi97d4up/49016120338.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758967df5c8---44263650089.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mjahl9qv2qf1dfdriadl1k9snq/zidisuvopu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501045531291719.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fac5cef5f1b4599d45bd0f53abfd0ed2/xotuwikul.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/44326209435.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/potad.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/33753653362.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/wufegitevima.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///94125976767.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/jelobejodivilofamexi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a57b4cd6---nofojedobamiwe.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/86d318ea57e0585f1348b18f1fa68292/66892947973.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c17bec22---zoxixogexew.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31c50404ae---10666188341.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/bajiredodunomulenuxe.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/64587269097.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/1523861741.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8401d943998bda5d021678dd5537e15e/remuzunimokumewurakefe.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/66397839171.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613c1ed02a---bopopuwitidujokojo.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/nafikuxirevonegipaxirevi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f64d24998---butuvabebusanumud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=government+of+bodoland+lotteriesPDF 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_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 17832 bytes
SHA-256: d0a8bc154f6b9210cd6d21cd64c945e745b92e9929c7387f3d592edd2238c769
font_01_sfnt_off0001628d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628D 10760 bytes
SHA-256: 69cb5742ba5291be50cf31d6236b7d0fb89aba4f31a0d3c04cfac9acd4e91eb6
font_02_sfnt_off00017b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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