Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0ef4c26e3c88db…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 07:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4911e1273006e2c6c2871307399cbf81 SHA-1: b3794a6adb1f78e9dbc8fa398c3dab69b4f58864 SHA-256: 8b0ef4c26e3c88dbdb6f28b467ab75ec08187a7890a4c396c11b4a17f04298e2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the primary function appears to be redirecting users to potentially malicious or SEO-manipulated content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c125c624014---xawabojifaxunazenet.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/refevi.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/wavetexanoxovovoziwikar.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1c50c0e90---bepatedapifelazilodim.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/24500181856.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f17164df427---xepajafadog.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47c701503---goberu.pdfIn PDF document text
    • https://epiphanych.com/images/file/fafumojaxomizutebebig.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/topoximaxekefazofapix.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/dujetowewejigovugivabid.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4dbde0396---zoxufavujapizubixixizut.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dolupezoravi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963748d02ff---pobetelajipedepiv.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6e7cac50---fuxivizekez.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/pakufivetewap.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a4ec7079---zejeradunelixalufinajelu.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/womejanomugosowulip.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/fiperiluxajin.pdfIn PDF document text
    • https://network-italia.it/file/xobavoxilamapuzaxuza.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/27470363980.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ac504e80---gosewosezudomuvuxisilevag.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/9866249918.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e916246bb1153e9d2db9155343cc8ece/4039308164.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4c07a0cef481e660307dfa20d5214378/wotosanero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=neuropsychopharmacology+and+therapeutics+pdfPDF 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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 11256 bytes
SHA-256: a8a6854e8676adb6872cd9d8b9b2e7a1aaaa778cde0d2432d3e18996dfb4305b
font_01_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 17580 bytes
SHA-256: 906cf2a54d4aeb93887b9feb413a3ba10d940d791e77589e0ad2f3a5351ed809

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