Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43a3a647cc2d949…

MALICIOUS

PDF

88.1 KB Created: 2021-07-30 21:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb262fae6e6ebb3c898e6896ab83689c SHA-1: 84f4ee5a459316eff5ed55883e9a2b665065d7ff SHA-256: a43a3a647cc2d949cd807368b783c34e60c1be631684ac7df2349fd1aba4f197
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a23474d21061b8b48af1595dcefe4d1d/46134097530.pdf In PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/wojik.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/79506423008.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nosowutigewewololat.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ffdfc08a038965b932dfbc52ad08e2ce/detijovut.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/h5jtcudvk1v00fnt7e8mvl4i25/zixagasatader.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/90288857965.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/80356577124.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c715da7b60---sijedura.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/21860010573.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a151e321521---91001062103.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xagogigogazujedaxetix.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4da386191068c47dc5b84c8609b7e76a/vagogagawabumelenipobepa.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/livuvajugibedaletobipa.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/pelemelakate.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/m07ftchk9ekojfmmelkaubuqq0/47406391406.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/67915956034.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acd32275ef7---jewegukuf.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/11073149109.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767754c3978---52863623477.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256891abc3---ridusutavawuxedogu.pdfIn PDF document text
    • https://nevisnews.com/userfiles/53250811219.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160861e4eafd30---92993891572.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/47989478809.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gapesozubivaruxujuxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=does+first+convenience+bank+have+mobile+depositPDF 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_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 11184 bytes
SHA-256: 0f0a32157eb1e20c5803e2b063808296f500c60818435e580bff33b8939bc34b
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 17412 bytes
SHA-256: 67c372d0e87f878714f815ac383bab72ea9aebe5b6ac4a61328ba9a24147e924

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