Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fba0c2485ddffe…

MALICIOUS

PDF

89.7 KB Created: 2021-07-18 10:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7843239e5a6aaa112cafe09e935d08d3 SHA-1: f572dae0a67e34ff0ff00823f93f27251dd0da5e SHA-256: 50fba0c2485ddffe830b7c177227ad50bf4625e89a1ce5511d97fd853219b283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL targets suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f5c05cc79376689cb5241e5e88e67708/pasumexogaxomufisag.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe01f85978---84091774271.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca15d34c9f6---zudapajasafisedusufulas.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/73hch7nhqa14363f1uirnl6v60/sivejanulipopevuxoz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd32b2369---rojuxelajulosoweda.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/48220798355.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/a18159fdb99gscpc8lsrofoknf/legos.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/naxudifiku.pdfIn PDF document text
    • http://huntland.hu/upload/file/lixegex.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/69268434390.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679d19ee2a---mujadexe.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a8d5096fc---85120088642.pdfIn PDF document text
    • http://domainecomps.com/documents/files/sutukebuvejobonovu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/aae71263984bdfd9e4488acc9c8239bf/gewoxuw.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/xaxugu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969754304b1---retotozamevanamunugerep.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010e934c09---12533407139.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210624033810_f7e6c.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/jopuzowipesokotekage.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e4a8778652f504c742f793786384bdbd/9387544346.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079998ec205b---gutomokijokedeziju.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/96617911965.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f080bdf7f1bdd8074a1c7d8ff22d9fca/13553332913.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd3974afa---ludilivoravixak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=charlotte%27s+web+chapter+16+summaryPDF 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_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 16636 bytes
SHA-256: cf1b0f3a2ad1ad41abfc10405a7b75d944cc3c63fcf89e7ca39e3d51fe7dff66
font_01_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 11168 bytes
SHA-256: 749efb576019abf29cdda0324bc30ba776de759ac37b124230944971ee6205f5
font_02_sfnt_off00014138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1